Rewrote the semi-controlled blink algorithm. Fixed the bug

reported by thiskidrob (where non-diagonal SCB was worthless.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@699 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on December 23, 2006
B4X67DGLW77QLGPTMORE2EJ5K5VA3TWIU23HFUF4TZDODXQSFLRQC
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