Added ~ for maps to request a trap that's in-depth for the current level.

The no_pool_fixup tag will prevent dungeon.cc from helpfully converting random deep water squares to shallow water next to floor.

Updated doc comments in .des files.

Fixed lexer to accept ~ as part of a map definition.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@807 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on January 8, 2007
L6O4LGZRKBURVWEY7XRVCSQLJ5RULNBEWMQJ6I2UYVWWB66FM3MQC
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