o _fastmath now builds and runs on PY3K
o Changes to setup.py to allow /usr/include for gmp.h
o Changes to setup.py to allow linking fastmath w/ static mpir
on Windows without warning messages
o Changes to test_DSA/test_RSA to throw an exception if _fastmath
is present but cannot be imported (due to an issue building
_fastmath or the shared gmp/mpir libraries not being reachable)
o number.py has the code to flag a failing _fastmath, but that
code is commented out for a better runtime experience
o Clean up the if for py21compat import - should have been == not is
o Clean up some '== None' occurences, now 'is None' instead
