FR 2093461: add player + allies FRIENDLY_PICKUP mode

Make Roxanne immune to disintegration (like ice statues). Move rock worms a bit lower in the dungeon and increase their damage (a tiny bit).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9428 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 12, 2009
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