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What does this MR do?

Add new options for the input of paramterization data and its attachment to the grid. The old options are removed.

• Add GridCreator for building grids.
• Add GridMapper which is called by GridCreator for load-balancing the grid and the mapping data.
• Upgrade H5File to read datasets with arbitrary H5 data types.
• Merge !55 (merged) into this.
• Implement reading a YAML parameterization file in FlowBoundary.
• Add unit tests for the new classes and functions (use !98 (merged)).
• Adapt system tests.
• Add (at least preliminary) documentation on usage of new features.
• Add pygmsh and h5py to virtualenv.
• Move creation of GridWrapper out of RichardsSimulation, see #97 (closed).
• Update docstrings of new classes and RichardsSimulation.
• [ ] Optional: Rename GridWrapper, see #97 (closed).
• Remove old parameterization and method run() (See !89 (comment 14708)).
• Remove old parameterization source files.

Additional performance tasks

• Replace calls to MPI with calls to Dune::CollectiveCommunication.
• [ ] Optional: Instantiate objects for GridCreator, GridMapper, and H5File explicitly. Remove template parameters where possible.

Is there something that needs to be double checked?

Not sure yet.

Can this MR be accepted?

• Implemented new features
• Added new tests
• Adapted tests
• Removed testing executables
• Pipeline passing
• Added docs
• Added entry to CHANGELOG.md
• Update README.md

Related issues

Closes #86 (closed)

Meta-issue #63 (closed)

See also #97 (closed)