Fix #193 (use RtlMoveMemory instead of msvcrt.memcpy)
Fix agent auth on Windows/Python 2.5) (with thanks to @lndbrg)
Support Py2.5 to Py3.4 for thread identity (thanks @lndbrg)
Try Py2.5 compatibility as last fallback for thread identity.
Add NEWS entry re #193 and friends
Clean up thread ident import/exec a bit.