must (pretend to) support all operations except assignments;
if you don't want to support an operation you have to provide
a dummy function that raises an exception...

Added _exit, exec, fork, getpid, getppid, kill and wait.

Don't report WE_MENU events with None as menu pointer;
Added stdwin.getactie() function;
Moved code to turn WINDOW* into windowobject* to a separate function.

Implement long_pow.

Moved some functions around.

Hide/show focus hacks around tedraw are no longer needed.

Fixed comments in number methods list

,.

turned abs() and divmod() into generic versions;
added pow().