Some assertions for behaviour_event().

In mons_place(), don't alert summons to the player's presence during arena mode.

In monster_grid(), don't do check_awaken() on monsters during arena mode.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8093 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 1, 2009
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