Add member path_taken to the bolt class, a coord_def vector defining the path

the beam took.

In mons_cast_noise(), if the spell's target isn't a dead-on hit for anything, then fire a tracer to figure out who it looks like the spell is aimed at.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8074 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 31, 2008
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