Plex: Starting parallel adaptation interface

Plex ex21: Test for interpolation performance

Plex: Added event for SF interpolation

Plex: swap DMPlexDistributeCoordinates() and DMPlexDistributeLabels()

Now the coordinate DM inherits the correct distributed labels via DMClone() in the first call to DMGetCoordinateDM().

Plex: Update to parallel Pragmatic interface

Plex: Use comm variable

Plex ex19: Added mesh distribution, and fixed parallel metric calculation

Plex-MED: Adding test output

Plex-Med: Read, communicate and identify facets in parallel

The comm pattern first sends all facets to a rendezvous partition that is
defined by the original vertex partitioning. The facets are then

Plex-Med: Read, communicate and identify facets in parallel

The comm pattern first sends all facets to a rendezvous partition that is
defined by the original vertex partitioning. The facets are then stored
vertex-wise and communicated over the vertex SF, so that each processor
that potentially knows about a facet now has a copy. We then identify
and mark facets locally via vertex joins as before.

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Plex: Optionally return vertex SF from DMPlexCreateFromCellListParallel

This is needed by file readers to use the created vertex partitioning.

Plex-Med: Switch to parallel facet reads from file

Plex: Cannot assume hash keys are sorted

Plex-Med: Adding partitioned reads of coordinates and cell-connectivity

This allows us to utilise the new DMPlexCreateFromCellListParallel()
routine for parallel reads.

Plex-Med: Apply facet IDs via vertex joins

Plex-Med: Build DM from cells and coordinated in the .med file

Plex-Med: Add skeleton reader for .med mesh files with simple tests

Remove unused variables

Plex: In projection, get Nc from DS instead of calculating it again

Plex: Need invJ for field projection

Plex: Fix bug with field projection
- We must tabulate the FE on the dual basis quadrature points

Plex: Correct handling of u_t in projection
- Should allow X_t to be passed in

Plex: Added field BC values

DM+KSP: Changed projection functions to accept multiple BC function types
- DMProjectField() now takes the time

DM+DS: Allow different kinds of BC functions
- Added DMBoundaryConditionType
- Changed DMGetBoudnary() and DMAddBoundary() and the DS versions

Plex ex3: Slight changes to convergence numbers
- How do we make these more robust?