Use global index sets by the dune-parmg module

This MR contains most of the changes of !22 (closed) , with some extra cleanup.

added 6 commits

• a84f6f58 - Make dune-parmg an optional dependency of dune-gfe
• 2a5938be - Exchange numbering of degrees of freedom in P1- and P2Mapper
• 9e6fa6ea - Use second order finite elements and YaspGrid
• 9ff4d872 - Correct name in globalp1mapper and remove unused includes
• a1dbbc9c - Add class GlobalMapper that will be extended by GlobalP1Mapper and GlobalP2Mapper
• e8461ca7 - Use std::make_shared to create the BaseSolver of the Trustregion Algorithm

Compare with previous version

added 3 commits

• cb1618f4 - Use std::make_shared to create the BaseSolver of the Trustregion Algorithm
• 66257f74 - Add class GlobalMapper that will be extended by GlobalP1Mapper and GlobalP2Mapper
• aa54315b - More GlobalMapper cleanup

Compare with previous version

added 1 commit

• cdbf933e - More GlobalMapper cleanup

Compare with previous version

added 15 commits

• cdbf933e...37efd1c5 - 8 commits from branch master
• d9c86e86 - Make dune-parmg an optional dependency of dune-gfe
• af3433bb - Exchange numbering of degrees of freedom in P1- and P2Mapper
• b134e694 - Use second order finite elements and YaspGrid
• e4e9a32e - Correct name in globalp1mapper and remove unused includes
• cc2e1eaf - Use std::make_shared to create the BaseSolver of the Trustregion Algorithm
• de04df4d - Add class GlobalMapper that will be extended by GlobalP1Mapper and GlobalP2Mapper
• 9e8073e1 - More GlobalMapper cleanup

Compare with previous version

added 9 commits

• 8cbb250e - Make dune-parmg an optional dependency of dune-gfe
• 573bb316 - Exchange numbering of degrees of freedom in P1- and P2Mapper
• e50e8569 - Use second order finite elements and YaspGrid
• eafd8a68 - Correct name in globalp1mapper and remove unused includes
• 1629fa85 - Use std::make_shared to create the BaseSolver of the Trustregion Algorithm
• 5a415476 - Add class GlobalMapper that will be extended by GlobalP1Mapper and GlobalP2Mapper
• 990fff86 - More GlobalMapper cleanup
• f83bbabf - Make harmonicmaptest work again without dune-parmg
• d9f43c84 - Merge branch 'lisa-parallel' of gitlab.math.tu-dresden.de:osander/dune-gfe into lisa-parallel

Compare with previous version

added 1 commit

• 78683378 - Make GlobalP2Mapper work without dune-parmg again

Compare with previous version

added 3 commits

• 538fc869 - Make dune-parmg an optional dependency of dune-gfe
• 73a507a5 - Use std::make_shared to create the BaseSolver of the Trustregion Algorithm
• 8a0baf59 - Add class GlobalMapper that uses dune-parmg for global index sets

Compare with previous version

merged

mentioned in commit 8e071367

mentioned in merge request !22 (closed)