boiling oil (trunk only)

boiling oil (trunk only)

     A suggestion from the newsgroup:  when potions are hit by fire and
get the "boil and explode" result, potions of oil should burn instead of
boil.  Even though oil can be heated to boiling, nethack's potions of oil
are noticeably flammable [just (a)pply one...] so having them burn makes
sense.  It's just a message change; no actual explosion has been added.

     destroy_strings[] was implemented as an {N} x {3} array that used
manually computed indices into one-dimension.  This changes it into a two-
dimensional array instead.  However, it's still being indexed by a bunch
of magic numbers.