Tweak Shoals algorithm to place the islands a bit more central and away from

the border (so they're not cut off anymore). Also add a new feature type DNGN_OPEN_SEA that is an impassible feature only intended for the Shoals border. Will need special handling for confusion, I guess. I've also tweaked the level generation, so Shoals vaults don't need to be connected anymore (the algorithm just adds superfluous floor corridors), but I still get loads of corridors on the bottom level - frustratingly enough only inside the map border, and they (usually) don't even contain any stairs or other features. It's maddening!

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10213 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 14, 2009
MPMVK6J5UQUFJ75SNRSPIBBSRTH67ZPDZKPZUF3RZRFKSERS62AAC
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