Fix more monster placement problems: After falling down shafts, if the

monsters weren't placed near the player, they'd all be placed at the same location, causing "floating monster" errors. Place them all near that same location instead, and check for terrain the monster can inhabit instead of just floor.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9298 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on February 28, 2009
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