Stack Deck interface improvements.

Incidentally, describe.cc needs to be fixed to describe marked/stacked decks properly.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2681 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on October 30, 2007
PTHJX2MZO5SDSHZMZOWBUPHUEZZPNU6NQAFOC6L3IYMO7C3C4UWQC
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