Have curses catch up with tty, X11, and Qt: if a menu of objects has
any heavy iron balls, their entries can be toggled on or off by using
'0' as a group accelerator. That's been supported by tty and X11 for
ages and by Qt since yesterday. This also supports having any digit
as a group accelerator so that the 'O' hack to pick number_pad mode by
typing the digit that matches the value description works (except for
menu entry for mode -1; '5' happens to work for that one but doesn't
match its description).
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