Make all spectral things levitate again, instead of flying if their base

monsters flew, since levitation provides immunity from falling into e.g. deep water due to being immobilized. Also, when enslaving a monster's soul, free the monster first if it's trapped in a net.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8313 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 7, 2009
4I62MHXSS7OWDF2QU7AYXCRB2ZAGHNCZQN24MENLXJFRSGMXXFLAC
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