Fixed tracers to handle neutrals.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1991 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on August 11, 2007
B3MFLKPJ34I2USQX7UM3SPDIFVGACB5HXYLEKT3FDULL57QOE2LAC
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