* VTK: Add patch for python 3.8 support
* CI: Re-enable VisIt in CI
* Configure spec matrix for stack with VisIt
* Add pugixml dep for 8.2.0
* Make VTK and ParaView consistent on proj dep
* OpenMPI 3: provides MP support by default
* Add details on proj dep in ParaView
* Add python 3.8 to test mock repo
* Patches to get VisIt VTK interface
* CI: Disable VisIt with GUI in DAV