Microsoft Visual Studio support

[Jarl Bong-Rundtörn]

Today we can announce an agreement between Swox and Microsoft that will
make future GMP releases much more easily accessible for users of
Microsoft(tm) Windows(R) Visual Studio(tm).

Microsoft will sponsor a transition of a configure+Makefile based
build system to one based on Visual Studio(tm) project files.  As part
of this deal, Makefiles usable for a release will be made available
after a 6 month delay.

"This agreement will allow GMP to broaden its user base to people that
have not until now been able experience a quality bignum library",
says Jarl Bong-Rundtörn, director at the division of bignum arithmetic
at Swox AB.