Add Mitsuhiro's new kraken tiles, slightly modified to make them work

with the water overlays. Experimentally disallow krakens (heads) to be placed in or move into shallow water. If the player wants to get rid of the source of all those tentacles he'll have to use ranged combat/spells or face the disadvantage of standing inside shallow water.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10731 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 19, 2009
EFM2EHMNHBA326V3F3H7WOPBZN2XU4GRTRHOFDX6SCIETUPM352QC
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