Threads, Callbacks, Classes [Long]

[Gerson Kurz]

Found it! The new version in

http://www.p-nand-q.com/python/pxfstest.zip

now works from a different thread, also. I built the debug binaries,
debugged, and saw that some state variable was null: you need to call
PyEval_InitThreads(), duh. Thread-support seems to get activated by
the first python thread (threading.Thread ??), too. 

I still have my doubts about the reference counts in the code, but hey
the callbacks work, what more can you ask.