A few additions to throwing nets.

Flying monsters could now fall into a pool if also confused, otherwise you cannot trap them with a net. Also special cases for a few other monsters.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2023 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on August 22, 2007
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