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smtk::mesh::ExtractTessellation: use hash map for point id lookup

T.J. Corona requested to merge tjcorona/smtk:extract-mesh-tess-use-search-structure into master

The method smtk::mesh::PointSet::find is extremely slow, and should be used only as a last resort. This commit replaces a call to find() within a tight loop with the construction and repeated query of a hash map.

NOTE: with this update, the mesh session now loads large datasets as quickly as the VTK session.

@dcthomp @bob.obara

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