ignore cell_sets "gmsh:*" inserted by meshio #695
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Fixes #691. It or something like it is required to be able to read a valid MSH 4.1 generated by Gmsh, e.g. the backward-facing step of exx 24, 27;
meshio.readinserts a cell-set called"gmsh:bounding-entities"which contains invalid cell-indices, causing ourskfem.io.meshio.from_meshioto raise anIndexErrorin attempting to parse it as a boundary.This cherry-picks ff83c84 from #693 which had expanded beyond its bounds, as discussed there.