mapping the 5 and 0 to '5' and '0' respectively
when NumLock is off, to make entering numbers easier. The core will map '5' and
'0' to 'g' and 'i' respectively. This solves W341-5.
Note: I changed nhdefkey.c and mhmain.c, so both the tty and the windows
interface will show new behaviour. I deliberately did not change nh340key.dll.
Note: Maybe the same change should be made to the MSDOS port.
Note: The behaviour of getobj is a little bit strange: It doesn't use
yn_question's facility for returning a number, but handles that itself. The
net effect of this is that if you type d55$ (to drop 55 zorkmids,) only the
first '5' is shown
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