fix bz130 - muse: sliming and fire horns

There was no check for being capable of using items when an attempt
to cure being turned into green slime picked scroll, wand, or horn
of fire.

Also, implement a 'TODO' in the same section of code.  Monsters
can enter fire traps to cure themselves from slime.  I made that
be for monsters smart enough to use items too, even though there's
no actual item involved.

doc/fixes36.1

@@ -175,6 +175,8 @@ prevent a hostile renegade Angel of <lawful god> from delivering taunt
 a few types of monster (barrow wight, Nazgul, erinys) have weapon attacks that
 	don't deal physical damage, so special damage like stoning via wielded
 	cockatrice corpse wouldn't be inflicted
+non-item-using monsters who happened to be carrying scroll or wand of fire or
+        a fire horn could use it to cure themselves of being turned into slime
 
 
 Platform- and/or Interface-Specific Fixes
@@ -239,6 +241,8 @@ when choosing an inventory item and '-' for bare-hands/fingers/no-ammo is a
 	choice, include that in the inventory menu if player types '?' or '*'
 feedback from probing of long worm now includes number of segments it has
 monk starts with 'shuriken' pre-discovered (despite language issue...)
+item-using monster on or next to a fire trap can use it to be cured of
+	turning into slime
 
 
 Platform- and/or Interface-Specific New Features