Fix [2504221]: if a monster gets both Slow and Haste (by being slowed and

then speeding up from Zin's Recitation power) don't give a confusing description. I left in the possibility of actually having both enchantments at once; arguably Slow should just be deleted in this case. Fixed doubled message when enchanting a creature with haste/slow.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8882 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 3, 2009
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