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Get tags from gmsh

Ben Sepanski requested to merge get-tags-from-gmsh into master

I made changes to the GmshMeshReceiver class in meshmode/mesh/io.py

Basically, I recorded a map from nodes to the elements that contain them, then populate boundary tags from "lower-dimensional" elements (which get thrown away) up to the higher dimensional elements that contain them.

Only physical tags of boundary dimension (i.e. dimension of the mesh - 1) are marked

Edited by Ben Sepanski

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