fix github issue #614 - applying polearm at doors

Reported by G7Nation; attacking walls and such with a polearm just
gave lackluster "you miss; nobody's there" feedback.

Make applying a polearm at some non-monster locations give feedback
similar to using 'F'orcefight with melee weapons.  Was
|You miss; there is no one there to hit.
now
|You uselessly attack the closed door.

Also, extend the supported locations to include dungeon furniture.
Was
|You attack thin air. ('F')
now
|You harmlessly attack the throne. ('F')
|You uselessly attack the throne. ('a')

This doesn't address #613:  attempting to hit non-visible locations
with an applied polearm.

Closes #614

doc/fixes37.0

@@ -658,6 +658,8 @@ melting ice timer could persist after the ice was gone from digging or from an
 using 'F'orcefight against iron bars while wielding something breakable could
 	yield erratic outcome because non-deterministic breaktest() was being
 	called twice and could yield results that conflicted
+have applying a polearm give feedback similar to 'F' for melee weapon when
+	attacking a wall or boulder
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository