DeformMeshRemap: moving location in source mesh of slave mesh to before lloyd smoothing.
  Adding bounding box calculation for use in relative displacement calculation, using displacements
  of about 1% based on communication with LLNL.

SpatialLocator: adding local_num_located and remote_num_located functions, which evaluate contents of locTable and parLocTable for this info.
  Also, when eval_set is set, pass it down to the tree too.

elem_eval_test.cpp: adding (commented out for now) test for LinearTri.
Tree, AdaptiveKDTree, BVHTree, various element types: changing tolerance model to using both iteration tolerance, for non-linear
  point in element iteration, and inside tolerance, for determining whether parameters are inside.

ElemEvaluator: instead of just asserting on negative jacobian, only do so if we're inside the element.
  Also using new tolerance model from above, and incorporating linear tri.

Adding a LinearTri class.