Fixed issues with substring matches of item names (spears being generated for

pears) in maps (David). The change also means that item names have to be specified in full in map definitions.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2233 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on September 28, 2007
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