This eliminates a whole bunch of the "Query truncated" entries in
the nethack.alt.org paniclog file by using safe_qbuf() where applicable.
It also makes selling queries and some other shop messages be less verbose
when shopkeepers are invisible (not uncommon after characters achieve see
invisible capability) by using shkname() to get "Manlobbi" instead of
Monnam()'s "Manlobbi the invisible shopkeeper" (something I had planned
to do even before seeing the truncations in that paniclog; repetition of
"the invisible shopkeeper" was very annoying when stepping through
multiple unpaid objects with itemized billing).
This also simplifies several GOLDOBJ conditional sections which
happened to be near the other code I was modifying.
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