Rewritten revealing area by sight of evil.

git-svn-id: http://keeperfx.googlecode.com/svn/trunk@1464 40a56aae-0377-11df-bfb3-7781b9cb07ea
Fixed a mistake in dungeon area recalculation pointed out by Jelle Raaijmakers.

git-svn-id: http://keeperfx.googlecode.com/svn/trunk@1465 40a56aae-0377-11df-bfb3-7781b9cb07ea