I don't try to toggle 'number_pad' very often, but when I do I almost
always type '0' instead of 'a' for Off or '1' instead of 'b' for On
on the first attempt. The menu shows
| a - 0 (off)
| b - 1 (on)
| c - 2 (on, MSDOS compatible)
| d - 3 (on, phone-style digit layout)
| e - 4 (on, phone-style layout, MSDOS compatible)
| f - -1 (off, 'z' to move upper-left, 'y' to zap wands)
This change makes '0' through '4' be undocumented group accelerators
for 'a' through 'e' (and '5' for 'f') in the sub-menu put up by 'O'.
tty and X11 worked as-is for '0' and required what amounts to a pair
of one-line changes to handle the other digits.
It doesn't work for curses and Qt (no idea about Windows GUI) because
they insist on treating any typed digit as the start of a count even
if one or more menu entries include that digit as a group accelerator.
(They also fail to support '0' as the group accelerator for iron-ball
class in the menu for multiple-drop.)
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