FR #2424917: holy monsters should drop non-summoned items when they die rather

than taking their entire inventory with them.

If a monster drops/fires/throws a summoned item the item will vanish (assuming it's not a fired/thrown item which returns to the monster).

Don't generate summoned monsters with throwing nets since the net will disappear as soon as it hits the target.

If a monster drops an item onto a item destroying grid the item will be destroyed, accompanied by the approriate sound. This should never happen, since monsters only drop items in order to pick up another one, and they can't pick up items off of item destroying grids since there won't be any items there, but maybe in the future confused monsters will spontaneously drop items or something.

Don't let orcs use orc-slaying weapons or draconians use dragon-slaying weapons.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7836 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 15, 2008
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