Initial files for the event horizon thorn. Everything is still empty.

git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinAnalysis/EHFinder/trunk@2 2a26948c-0e4f-0410-aee8-f1d3e353619c

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+Cactus Code Thorn EHFinder
+Authors    : Peter Diener
+CVS info   : $Header$
+--------------------------------------------------------------------------
+
+Purpose of the thorn:
+
+To find the event horizon of a numerical spacetime by integrating a null
+surface backwards in time. The basic equation is equation 2 in Anninos et. al,
+Physical Review Letters, 74, 630, 1995.
+
+The surface will be parametrized as the 0 value isosurface of a level
+set function. Hopefully this will work when the topology changes from
+one common event horizon to two individual event horizons.