stopped by AC and when at least some of it bypasses AC but it is completely stopped by resistance. Fix bug where determine_damage() was ignoring AC. Fix negative energy always being known even if it hits something you can't see.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9027 c06c8d41-db1a-0410-9941-cceddc491573
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