Allow alternating items with "nothing" to control generation chance. Example:

ITEM: heal wounds / nothing

Generation weight can be set with the weight: tag, which defaults to 10, so: ITEM: weight:1 heal wounds / nothing generates a potion of heal wounds 1 in 11 times it is used.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@601 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on December 9, 2006
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