Allow adding amount=X property to timed markers to make them timed toll markers (due).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10610 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on August 29, 2009
PMUW6DSCZZ2F4HR2KJHKA4GOGES3B7COFCGBL47NY2THU5LLMWLQC
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