Merge topic 'newest-xdmf' into next

94dea340 expose subsets in xdmf3 reader
fcc3b2f1 bump vtk to get xdmf3 with subsets and functions
Merge topic 'compilation_issue_processxml' into next

245c75c8 Fix slow compilation via processxml
Merge topic 'remove-mpi4py' into next

9ae2beb3 mpi4py: remove
Merge topic 'appdata-file' into next

e7db5bec paraview: add square icons for Linux menus
5ff6e8a1 paraview: install an AppData file
479ebf65 paraview: install a .desktop file on *nix
Merge topic 'fix-cache-doc' into next

a27641a8 cmake: fix docstring for VTK variable overrides
Merge topic 'pass_connectid_to_autompi' into next

e7e81521 Pass "connect-id" to AutoMPI server.
VR: remove moc wrapping of QObject-less headers

Change-Id: I12ef58e074bde23467ac645683c9c2dfc07fb6b3
Merge topic 'excess-moc-wrapping' into next

15de42fd VR: remove moc wrapping of QObject-less headers