Fix a bug in x86_64w/sqr_basecase.asm.
Removed an unnecessary file and lots of very broken references to it.
Fixed a funky bug which only shows up on Windows in mpn_mulmod_basecase.
merge Bill's latest changes
Merge branch 'master' of https://github.com/wbhart/mpir

Conflicts:
	mpn/x86_64w/sqr_basecase.asm
update VS 2012 builds and correct bug in mpn_sqr_basecase
remove deleted tests from Windows builds
Further update to VS 2012 builds