*BEFORE* APPLYING THIS PATCH, YOU MUST
% svn move Include/py_curses.h Modules/_py_curses.h
(A "patch" can't convey that sort of information.)

I made a pass cleaning up _curses and _curses_panel.  Mainly I cleaned
up the header file, moving unnecessary things into the two .c files.
I also changed the way information is passed from _curses to
_curses_panel.  Instead of a Py_CObject which points to functions--which
Neil Norwitz suspected could be a security hole--it now passes cleaner
information (one type, one int * pointer).  Finally, I made a
code-cleanup pass as per PEP 7.