Change floor_property (blood, sanctuary) to flags, and add two new

settings: vault and highlight. Vault means a grid is part of a vault (set in dungeon.cc), and currently used to exempt vault grids when shifting labyrinths. Highlight is a meta flag currently only used to highlight labyrinth changes on the 'X' map in wizard mode, but I can think of a couple of other uses, mostly for debugging purposes.

Also replace a few for loops in the lab shift function with rectangle_iterators.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7414 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on November 7, 2008
J7GPW2YXLT6FGSKJ24FGQ24GTRZ6A2BDYM6CIXV4R6YBEHP6BGPAC
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