Apply caotto's Feawn evolution update patch in [2841648], with a few

tweaks.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10615 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on September 3, 2009
TR6F3WVSL6TS5SZVGJBGDK54FKAXYWRWXFRNMQ2AYYKHADSHR2EQC
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