Pull yes or no questions requiring a typed "yes" into into a yes_or_no(),

analagous to "yesno". Tested with zot,lava,water,quit.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3666 c06c8d41-db1a-0410-9941-cceddc491573

Created by  pauldubois  on March 15, 2008
POETVWRYRKRTPDOAM6YLJRBAWF7QDCOUCK3JPQURB2Y4PJN7EE2QC
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