Reduce arena end-of-round delay, do arena LOS from current LOS center, not center of displayed grid (vgrdc can be different from glosc() if view_lock=no). Also fix monster behaviour to seek instead of wander in the arena.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8119 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on January 2, 2009
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