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The C prototype for getch is 'int getch(void)', not
'chtype getch(void)', as assumed by _cursesmodule.c
(the same for ungetch and keyname). [I've checked this
under Linux, SunOS, and Tru64]
keyname() seems to segfault if passed -1, so I've
tested for that.
In addition, according to the docs, the .getch() and
.getkey() methods of a window object should throw an
exception when there isn't any input in nodelay mode
(the C functions return ERR (== -1) in this case). I've
fixed getkey, but not getch, in this patch: since getch
returns an int anyways, it seems better to return -1 on
no input.