When a vault guard was created it was producing a "guard appears"
message, then the vault code immediately produced a "vault's guard
enters" message. Suppress the creation message.
While testing that, I noticed that if the hero was blind and lacked
telepathy, "someone enters" started the guard interrogation sequence
but if hero answered and dropped gold, the way out wasn't discernable.
Put a "remembered, unseen monster" glyph at the guard's spot in the
breeched vault wall. The player will need to do <search><move> over
and over to actually follow the guard but at least will know where to
start doing that.
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