Make the Ice Caves use Cocytus floor and wall tiles. (These could stand

to be improved since it's not at all obvious they're supposed to represent ice.) This is, of course, provisional until tiles can be set in the maps themselves.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7605 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on November 25, 2008
OHKIZHRISXKWSVNXJF2YJRK5OL72K4LUOSV7FACX6VN6AUDPLXCAC
Change contents