Adjust monster habitats again. Remove the M_AMPHIBIOUS flag, and

replace it with two new habitats: HT_AMPHIBIOUS_LAND and HT_AMPHIBIOUS_WATER, to indicate which habitat a monster prefers. This effectively gives amphibious monsters primary and secondary habitats; check both when trying to place such monsters. With these changes, merfolk can be placed on land properly (via wizard mode's &M) when no water is around. The one monster that can move through rock is affected as well: rock is its primary habitat, while land is its secondary one.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7142 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on October 5, 2008
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