dipping and greasing (trunk only)

dipping and greasing (trunk only)

     From a bug report:  you
can dip a worn item such as shirt or suit into a potion of polymorph and
it will become unworn--but as of a couple of days ago, unworn only if the
transformed object's new form can't be worn in the same slot--even if it
is covered by a cursed worn item (suit or cloak).  It didn't seem like
trying to fix that special case would be very worthwhile; this fixes the
more general situation of "you could dip worn items even though they were
covered up by other worn items".

     In the same report:  you could apply grease to rings while wearing
cursed gloves.  The code already prevented greasing a suit when it was
covered by a cloak (regardless of whether that cloak was cursed), and a
shirt when it was covered by a suit or cloak or both.  This moves that
code into a separate routine which is used for dipping as well as for
applying grease, and now handles rings vs gloves.

     Since covered rings, shirt, or suit are no longer eligible to be
dipped or greased, this also makes "?" for the pick-an-item prompt leave
such things out of the list of likely candidates.