Fix 1941612: Zapping wands known to be empty shouldn't cost a turn, but

         empty wands with unknown charges should cost a turn.

Experimentally add a "Really fire through friendly creature?" prompt when a beam tracer passes through a friend. This currently uses the existing monster tracer and probably has huge problems because of this. In any case, it appears to only work sometimes, though consistently for wands in my testing, possibly because the range is fixed (?) when compared to spells. (This is part of FR 1962548.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5171 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on May 21, 2008
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