Add more habitat cleanups: rename HT_NORMAL to HT_LAND, remove

HT_SHALLOW_WATER, and rename HT_DEEP_WATER to HT_WATER.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3183 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 3, 2008
WMHFDQKUDCUGM3R245LLVZ5NNEZSCXFDSTNMVS2O5EFUHHO7HU3AC
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