Log Message:
Update Libtommath to version 0.42.0

pkgsrc changes:
+ Add license
+ Update master site

Changes since last pkgsrc version (0.39):
July 23rd, 2010
v0.42.0
       -- Fix for mp_prime_next_prime() bug when checking generated prime
       -- allow mp_shrink to shrink initialized, but empty MPI's
       -- Added project and solution files for Visual Studio 2005 and Visual \ 
Studio 2008.

March 10th, 2007
v0.41  -- Wolfgang Ehrhardt suggested a quick fix to mp_div_d() which makes the \ 
detection of powers of two quicker.
       -- [CRI] Added libtommath.dsp for Visual C++ users.

December 24th, 2006
v0.40  -- Updated makefile to properly support LIBNAME
       -- Fixed bug in fast_s_mp_mul_high_digs() which overflowed (line 83), \ 
thanks Valgrind!