Made default targeting an option (default_target, defaults to false.)

If default_target is set, direction() now starts on the closest target (as if you pressed '+') if your previous target is invalid. Removed old fizzle check option. Ctrl-T is now free.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@902 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on January 29, 2007
45QV77UI6QFW4234P365LD3FGJYRVWTT5455DPB324NG2NFQMKTQC
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