monsters defending against slime (trunk only)

Like their use of lizard corpses to defeat being turned into stone,
let monsters use wands of fire, fire horns, and scrolls of fire to try to
defeat being turned into slime.  If the scroll is read while confused, it
won't succeed.  Otherwise, monsters who don't resist fire will take some
damage in the process and might end up killing themselves (although with
the testing I've gone I've yet to see that happen--I guess that means
that handling for dying-in-the-process hasn't been adequately tested...).

     So far, they don't know how to jump onto adjacent fire traps, nor
will fire breathing monsters breath at themselves.  I don't know whether
I'll get around to tackling either of those.

doc/fixes35.0

@@ -325,6 +325,7 @@ scroll of taming/spell of charm monster now gives some feedback
 doppelgangers can take on the shape of alternate roles' quest guardians
 pile_limit option to control when to switch to "there are objects here"
 	vs listing objects on floor when hero goes over objects while moving
+some monsters will use fire to prevent selves being turned into green slime
 
 
 Platform- and/or Interface-Specific New Features