Cleaned up monster generation functions, separate monster zombie type from monster number. May be buggy.

Allow hydra zombies (they currently do not get the right number of heads).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4872 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on May 5, 2008
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