In an attempt to make bears not both rare and unremarkable, they now often berserk when fleeing. Uses berserk rage as an escape "spell". No changes to vaults (esp. Ice Caves) yet, the situation is being monitored. (patch by due)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10726 c06c8d41-db1a-0410-9941-cceddc491573

Created by  evktalo  on September 19, 2009
DMAHEX6B3PA6ALJAOQUBF2OWOIKJXHYARWNRIN64252SECR23N4QC
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