Changed list_spells() somewhat. It's now a slider wraparound menu.

(Also changed the meaning of what some of the flags do to slider_menu, the default behaviour should be unaltered.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1423 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on May 8, 2007
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