Shop items stolen or destroyed without being in inventory were handled
inconsistently compared to simply picking up unpaid items because different
criteria got used to decide whether the shk cares about something. Last
December a hack to deal with this for container contents was introduced but
that left the problem for ordinary items. This patch attempts to address
it by using a common check for theft and for pickup's add-to-bill.
It hasn't had nearly enough testing and I won't be very surprised if
one or more new obscure shop bugs have now come into being, but perhaps
they'll at least be consistent bugs as far as shop billing is concerned....
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