Implementation of 1609111: resting gives a message when it stops

explaining why. Theoretically, the message should be in MULTITURN_ACTION, but since some people (ahem) dislike that channel, I've put it in PLAIN.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@605 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on December 9, 2006
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