Renamed MshEdit files to MeshLayerEdit
renamed removeMeshNodes to removeMeshEntities
moved removeMeshElements from Mesh to removeMeshEntities; optimised removeMeshNodes a bit
Merge branch 'master' of https://github.com/ufz/ogs into AddMeshEditingDialog
added mesh element removal concept and options from NW
placed removeMeshNodes() outside of new class again, does not fit anymore
renamed element removal class to ElementExtraction
Added GUI-dialog for removing mesh elements
fixed based on pull request comments
Merge pull request #245 from rinkk/AddMeshEditingDialog

Mesh element removal in GUI