• workaround: ignore 'tparm() returned NULL', this occurs on win32 platforms using PDCurses_ where tparm() is not implemented.
• enhancement: new context manager keypad(), which enables keypad application keys such as the diagonal keys on the numpad.
• bugfix: translate keypad application keys correctly to their diagonal movement directions KEY_LL, KEY_LR, KEY_UL, KEY_LR, and KEY_CENTER.