[gmsh] Insert boundary segments for 1d grids
Boundary segments were not inserted for 1d grids (where boundary segments are single nodes). However this is needed to e.g. attach boundary data to a Dune::FoamGrid<1, 3>
or Dune::OneDGrid
.
- Fixes #93 (closed)
- Adds a test for 1d gmsh boundary data with OneDGrid
Edited by Timo Koch