Allow multiple MAP sections per map (maps can be conditionalised with Lua).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1643 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on June 24, 2007
6JGTYQKIAHVHQIBZ6RKSLIRIQHE3EJZUEY4IOXU5TTN654JV7KHAC
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