Change arena item culling to cull oldest items first instead of most boring

items first.

Removed arena tag "move_spawners", replaced it with "move_summons", which moves summons to a random location as soon as they're placed.

Added tag "summon_throttle:", which if set prevents summons from being placed if the summoner has N or more allies.

Make arena monsters ignore test spawners, since spawners are only pseudo-monsters placed in order to summons real monsters (plus attacking them is a waste of time since they're unkillable).

Tell the arena when a corpse is placed.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8349 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 8, 2009
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