Otherwise dir(_sre.SRE_Match) returns an empty list.
First step: handle most occurrences, remove tp_getattr and fill the tp_methods and tp_members slots.
Add some test about attribute access.
For more comments, read the patches@python.org archives.
For documentation read the comments in mymalloc.h and objimpl.h.
(This is not exactly what Vladimir posted to the patches list; I've
made a few changes, and Vladimir sent me a fix in private email for a
problem that only occurs in debug mode. I'm also holding back on his
change to main.c, which seems unnecessary to me.)
