Fix debugging ray zaps (e.g. unknown wands) always setting obvious_effect by

making ZAP_DEBUGGING_RAY no longer an obvious_effect. It might be more correct to restore obvious_effect on a tracer, or at least a player_tracer, but bug 2515082 [and r8500] makes me cautious. Fix healing being too generously identified. Fix wand of healing not working on enemies if you happen to worship Ely. Fixes [2580106]. Also some dead code elimination.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8982 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 8, 2009
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