Log Message:
Update to Mathomatic 15.2.0

CHANGES MADE TO MATHOMATIC 15.2.0 TO BRING IT UP TO THE NEXT VERSION:

All makefiles were improved.  Library test/example program is renamed to \ 
"testmain".

Package maintainers please take note: support for the DESTDIR environment \ 
variable was
added to the makefiles; for proper operation when packaging version 15.2.1 or higher,
please remove any patches for missing DESTDIR support.
m4 Mathomatic should work now when included in the Mathomatic package (make \ 
m4install).
Thank you for packaging Mathomatic!  If I did anything wrong, please let me know.

8/26/10 - Added the -e option, which processes mathematical expressions and \ 
Mathomatic commands
          instead of input files on the shell command line.  For example, entering
          "mathomatic -eq 2+3" gives "answer = 5".  This \ 
functionality has been requested
          many times by Mathomatic command line users.  A complete example:

CHANGES MADE TO MATHOMATIC 15.1.6 TO BRING IT UP TO THE NEXT VERSION:

Minor improvements were made to the user documentation.

8/22/10 - Removed "Complex number roots approximated" warning message, \ 
since this happens often.

          Capitalized E, I, PI, and Pi are now accepted as the universal \ 
constants e, i, and pi,
          without needing to enter "set no case".  This allows \ 
Mathomatic to easily
          accept Mathematica style expression input.

          m4 Mathomatic now additionally accepts Mathematica style capitalized \ 
function input.
          matho and rmath now display elapsed, CPU, and system times in seconds \ 
upon exit.

8/23/10 - Fixed #equation-number entry at the main prompt to always work and \ 
allow an expression
          or equation following on the same line to be entered at that equation \ 
space.
          For example: "#10 y=1/x" will work now;
          previously only worked if equation space number 10 was previously \ 
allocated and used.
          The way it works is: all equation spaces up to and including number 10 \ 
are allocated,
          if not already allocated, upon entry of "#10".
          Equations spaces are allocated with the memory allocator malloc(3).

CHANGES MADE TO MATHOMATIC 15.1.5 TO BRING IT UP TO THE NEXT VERSION:

7/26/10 - Disabled ncurses call for auto-color detection when CYGWIN is defined while
          compiling the source code, due to a reported problem of readline \ 
failing with
          ncurses in Cygwin.

7/28/10 - Disabled readline history save file for the Cygwin port,
          because it is a filename that starts with a period.

7/31/10 - Added "set fractions_display" option, to allow disabling the \ 
automatic conversion of
          fractions like .5 to 1/2 for display.
          Developer requested and useful in the symbolic math library,
          when numerical fraction output isn't wanted.

8/01/10 - Fixed a memory leak when ignoring the output string in the symbolic \ 
math library.

8/04/10 - Preserve overflowed powers like 2^2222 rather than aborting with an \ 
error message.
          Allow simplification of math like 2*2^2222 and 2/2^2222.

8/08/10 - matho-primes runs twice as fast with the -ffast-math gcc compilation \ 
option,
          which is now enabled by default.  Don't try -ffast-math with the main \ 
Mathomatic
          program though, because then Mathomatic won't work properly.

CHANGES MADE TO MATHOMATIC 15.1.4 TO BRING IT UP TO THE NEXT VERSION:

Many minor tweaks and improvements.

7/03/10 - Makefiles and compile scripts were corrected and enhanced
          per http://www.gnu.org/prep/standards/

7/06/10 - Changed all "#if true" and "#if false" conditional \ 
commenting to "#if 1" and "#if 0"
          in the C source code, thanks to Min Sik Kim of NetBSD pkgsrc.

CHANGES MADE TO MATHOMATIC 15.1.3 TO BRING IT UP TO THE NEXT VERSION:

All of the Unix man pages and user manuals for Mathomatic were fixed.

The compare and "solve verify" commands now simplify more thoroughly \ 
with "repeat simplify"
for better expression equality determination.

6/17/10 - Greatly improved file operation error reporting by using the perror(3) \ 
function.

6/18/10 - Fixed categories in "icons/mathomatic.desktop";
          Mathomatic now goes under valid categories, mainly Education.

CHANGES MADE TO MATHOMATIC 15.1.2 TO BRING IT UP TO THE NEXT VERSION:

6/6/10 - I made mistakes in the improvement to the simplify command of version \ 
15.1.2,
         the original working simplify logic of version 15.1.1 is now restored, \ 
sorry.

CHANGES MADE TO MATHOMATIC 15.1.1 TO BRING IT UP TO THE NEXT VERSION:

A general cleanup was done.
A small improvement was made to the final result of the simplify and fraction \ 
commands.
Showing intermediate results in the calculate, sum, and product commands is now \ 
done with "set debug 1".

5/28/10 - Added "tests/collatz.in", the Collatz conjecture as an \ 
automatically computable equation.

CHANGES MADE TO MATHOMATIC 15.1.0 TO BRING IT UP TO THE NEXT VERSION:

Code and documentation cleanup.

5/21/10 - Added "primes/matho-sum", a utility that sums its command \ 
line arguments or standard input.
          Use "matho-primes 0 2000000 | matho-sum" to find the sum of \ 
all primes less than 2,000,000.
          Solves Project Euler problem #10: \ 
http://projecteuler.net/index.php?section=problems&id=10

5/23/10 - Primes (') are allowed in variable names now, if not using the \ 
symbolic math library, so that the
          derivative, integrate, and nintegrate commands can change the \ 
dependent variable to y', y'', etc.
          This can be turned on in the symbolic math library by the command \ 
"set special_variable_characters='".

          Non-alphanumeric characters in variable names are now converted to \ 
underline characters (_)
          when exporting to a programming language or to a different program.

CHANGES MADE TO MATHOMATIC 15.0.8 TO BRING IT UP TO THE NEXT VERSION:

5/10/10 - Added "help constants" command.

5/11/10 - Integer variables are now specified by using a variable name that \ 
starts with "integer",
          like "integer1", "integer_x", etc.  Currently only \ 
the modulus operator "%" checks
          for integer variables, to help with simplification.

5/12/10 - Corrected the output string type of the symbolic math library API.  It \ 
was erroneously declared
          as type "const", possibly causing a memory leak.

5/13/10 - Moved and adapted "makefile.lib" to \ 
"lib/makefile", so the symbolic math library build is isolated.
          Previously "make clean" was required between different \ 
builds.  All makefiles require GNU make now.

CHANGES MADE TO MATHOMATIC 15.0.7 TO BRING IT UP TO THE NEXT VERSION:

4/26/10 - Allow "make pdf" to generate PDF documentation from the HTML \ 
documentation with htmldoc.
          Please read the comments in the makefile for all available options.

4/29/10 - For every makefile, CFLAGS has been modified to include OPTFLAGS as \ 
required by the Fedora Linux
          build system, and OPTFLAGS defaults to the optional gcc specific flags \ 
like optimization.

          In the symbolic math library, made available the equation number of \ 
the result of calling the API,
          if also stored in an equation space.  The result equation number is \ 
stored in the global "result_en".
          Useful if you want to know where the result was stored, to act on it \ 
with further commands.

CHANGES MADE TO MATHOMATIC 15.0.6 TO BRING IT UP TO THE NEXT VERSION:

Corrections and improvements to the documentation were made.

4/3/10 - Vastly improved the "factor number" user interface, now \ 
factors integer expressions like 2^32-1.
         "factor number" is disabled in library mode.

4/13/10 - The real and imaginary commands no longer fail when the expression is \ 
not complex,
          just a warning is given.

4/14/10 - Changed normal display of "-1*" to "-", for \ 
prettier 2D expression output,
          so things like "-a" display properly, not as "-1*a".

CHANGES MADE TO MATHOMATIC 15.0.5:

1/28/10 - Added a Python utility called "primorial" to the Prime \ 
Number Tools install
          that multiplies together the results of matho-primes, displaying the \ 
primorials
          of the integers given on the command line.

3/18/10 - Changed author email address to "gesslein@linux.com".

3/23/10 - Catch SIGHUP and SIGTERM signals for proper termination of the \ 
Mathomatic program;
          readline was messing up when Mathomatic was terminated by closing the \ 
shell window.
          The plot command now always plots expressions with grid marks \ 
displayed for reference.

CHANGES MADE TO MATHOMATIC 15.0.4:

1/21/10 - In the makefile, changed the HTML man page generator back to rman because
          groff HTML output looks really bad and rman allows linking to other \ 
man pages.
          groff is no longer used.

1/24/10 - Fixed "make m4install", the installed rmath and matho \ 
programs weren't working.

1/27/10 - Added GNU LGPL license notices to every C source file with a copyright \ 
notice,
          for proper protections.

CHANGES MADE TO MATHOMATIC 15.0.3:

1/9/10 - Fixed a problem only in the version 15.0.3 makefile, where it didn't respect
         the CC environment variable set by the user, instead it always used \ 
"gcc"
         as the C compiler.

CHANGES MADE TO MATHOMATIC 15.0.2:

12/27/09 - Moved get_screen_size() from main.c to am.c because it is used in the \ 
library when
           compile-time options UNIX or CYGWIN are defined.
           Thanks to Cygwin port maintainer Reini Urban for noticing and fixing \ 
this problem.
           Defining UNIX or CYGWIN in library mode is not recommended.

12/31/09 - Added code to allow any command to be preceded by "repeat", \ 
which sets the
           repeat flag for the following command.  Most commands ignore the \ 
repeat flag.

1/1/10 - Ported divide and roots commands to be repeatable.  Also repeatable are the
         calculate and eliminate commands.

1/2/10 - Allow Taylor series computation even if the specified differentiation \ 
variable
         is not found in the expression, giving a warning.
         Ported simplify command to be a repeatable full simplify; that is, typing
         "repeat simplify" repeatedly runs the simplify command until \ 
the result stabilizes
         to the smallest size expression.

1/7/10 - Thanks to pretty C code submitted by Simon Geard,
         the code and variables commands have been made much more readable.

1/8/10 - Made Mathomatic easier to compile under Solaris, thanks to Michael \ 
Pogue of Sun.
         Fixed failure to compile under BSD Unix when compiling with readline \ 
support.

CHANGES MADE TO MATHOMATIC 15.0.1:

12/19/09 - The last few versions fix the ugliness caused by the GCD factoring \ 
change made on 6/22/09.
           Today's change factors out the numerical GCD of rational coefficients \ 
as needed to simplify.
           Most simplification results should be beautiful and the simplest \ 
possible again now,
           without the misleading observed magnitude caused by always factoring \ 
out the GCD,
           which was why the change of 6/22/09 was made.

CHANGES MADE TO MATHOMATIC 15.0.0:

12/12/09 - Fixed a problem with the -q (quiet mode) option being ignored if the \ 
session options
           were ever saved with the "set save" command.

12/13/09 - Added code to allow Mathomatic output to be redirected by default.
           Fixed the derivative command to be successful even when the result is 0,
           when compiled as a library.

12/14/09 - Added ability to log symbolic math library results, and made command \ 
behavior
           more consistent in the library by always returning the final result \ 
string.

12/16/09 - The factor command now factors more by factoring out the GCD of \ 
rational coefficients.

CHANGES MADE TO MATHOMATIC 14.6.3 TO BRING IT UP TO 15.0.0:

Cleanup and more bug fixes.

11/26/09 - Added detection of the terminal's ANSI color availability, when \ 
readline is enabled.

11/28/09 - Added detection of divide by zero and NaN when using the "solve \ 
verify" command,
           for more correct results.
           Solving now factors out the GCD of rational coefficients, for \ 
improved results.
           The fixes today are from errors solving equations like (2*x/(x - 3)) \ 
+ 3 = 6/(x - 3)

11/29/09 - Disallow the variable named "nan".  NaN cannot be directly \ 
entered into Mathomatic.

11/30/09 - Added shell scripts "t" and "tests/t" to easily \ 
test Mathomatic by typing "./t".

12/2/09 - The fraction command now factors out the GCD of rational coefficients \ 
like the
          solve command does, so that coefficients in algebraic fractions become \ 
integers.
          The GCD verifying routine was perfected by making it very strict, like \ 
it should be.