B01006 - containers hitting the floor

<Someone> noted that if you dropped a box while levitating, nothing would
break.  This is true for sacks too, which shouldn't be immune either.
Throwing didn't break contained objects either, not mentioned in his report.

Refactored out the code in kick_object that handled damage for objects
contained in normal containers and added calls in hitfloor and throwit.
kick_object still only calls it for boxes, but other callers will call it
for any object letting it decide if damage is required.  BoH objects aren't
affected, since traditionally the inside of the BoH is "somewhere else".

doc/fixes34.2

@@ -31,6 +31,7 @@ allow all tame monsters that eat to consider food thrown to them
 the screen display wasn't always up to date after map topology changes
 jumping over a sokobon pit would result in the player next to, not in, the pit
 don't let arrow, rock or dart traps provide an infinite number of objects
+dropping from height or throwing a normal container may damage contents
 
 
 Platform- and/or Interface-Specific Fixes