Add line to Slime branch description about wall damage.
Add line to slime wall description about acidic damage.
Clean rltiles/tiledef-unrand.cc in the right Makefile.
Fix up dependencies for art-data, and make the build output less deceptive
Euthanize sick needles.

They produce no interesting or even really noticeable effect, and their
usefulness is really situational.
Whitespace fixes.
Typo fix.
Fix a crash when a monster dies partway through a cleave it is performing

This could happen if, for example, the cleave caused a ball lightning to
explode and kill the attacker before all targets within cleave range were
attacked.
Fix a typo in the Slime branch description, adjust wording
Tweak wording.
#ifdef out potions of gain ability
Better gem_glass wand tile
Don't allow treeform to go up or down stairs
Fix inconsistent punctuation.
Make "You cannot move." a canned message.
Whoops, don't make art-data rebuild every time.

I guess I forgot how phony targets work :-(.
List one more player form in the changelog for Polymorph.
Make undead frogs 'z', as planned.
Don't mark pies as "inedible".

This check doesn't seem to be used, but hey.
Fix an inoperative battlesphere check.

It's redundant now, though, we had to work around this to prevent mysterious
crashes.  Here's what was the cause.