zap-to-char trivial enhancements

[Dan Jacobson]

[Severity: no big deal, fix something more important instead.]

Perhaps zap-to-char's prompt should say "Zap to char (backwards):"
when e.g. ESC - ESC z is used.   Maybe it should also say other things
when given different arguments, like telling the user it is about to
zap to the 4th char when given ^U, etc.

Perhaps even say more than "search failed" when zapping the 36th Q
when there are only 14 left before file's end.
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