Log Message:
update to verilog-current-20040828

changes include:

Added support for the `default_nettype directine, including the
default net type of "none", which turns off implicit net declarations.

Signed /, % and >>> in nets should now work properly. Also, various
operators of all sorts applied to constants have been improved.

Ranges now work on localparams.

Added the system tasks $unsigned, $is_signed, $mti_random and
$mti-dist_uniform. See the make README.txt for a description of these
system functions. Also, flesh out the standard random number
generators to match the sequences generated by other compilers.

There is now an "sft" file that describes to the compiler the return
value of system functions. This allows user supplied system functions
to have interesting return types. See "SYSTEM FUNCTIO TABLE FILES" in
the iverilog man page. Include a sft file for the system functions,
and move the system functions over to that mechinism.

Fix the behavior of $fgets in tight fitting result buffers.

A variety of compilation environment fixes have been added. These
involve configure scripts and Makefiles.

And of course a variety of other bug fixes, and so on and so forth.