Expand monster speed handling to work on the level of individual

monsters.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7166 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on October 6, 2008
T733XSIG74E7A6ELESROLHEVNVTTRPMVAWPAG5NYJ73V63H2GWJAC
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