Export of EGFunctions not fully implemented for 3D

Currently (on the master) it is not possible to export EGFunction objects living on 3D meshes. This is not directly obvious, either, as the VTKOutput class will silently do nothing in this case.

On the branch https://i10git.cs.fau.de/hyteg/hyteg/-/tree/mohr/extendVTKOutputTest-mc I have extended the VTKOutput class such that it attempts to perform the export, if asked. In this case the WALBERLA_ABORT of VTKDGWriter::writeVectorFunction() kicks in and we at least see, that there is a problem.

I am going to de-activate VTKoutput in

• EGApplyTest
• EGFunctionspaceTest

to make the pipeline for my branch run through and also because I doubt that in most test scenarios it makes sense to produce output in the pipeline. Perfectly fine to have the code for outputting in the test, though. As this can help to analyse problems, when the pipeline fails.

IMHO this issue should be addressed soon.

Cheers
Marcus