ElemEvaluator: in set_ent_handle, if there's no evalSet for that entity type, call EvalSet::get_eval_set
SpatialLocator: set the evaluator on the tree if it's not the same as what's on SpatialLocator; also, replace find_point logic
  (that used distance_search for some reason) with call to Tree::point_search.
AdaptiveKDTree: move parse_options to public function, as it is in Tree
BVHTree: fixed bug, where BVHTree had its own myEval shadowing the one declared in Tree
Tree: fixed bug, initialize myEval to NULL in constructor
spatial_locator_test: test trees with and without evaluators
DataCoupler: improving comments a bit, and move ParallelComm down in arg list for constructor; also, some
  improved comments
datacoupler_test: adding test


Passes make check in parallel.