Release notes
- Dependency on ParMetis removed: root rank does the decomposition and broadcasts the results. This limits the size of problems that can be run (but ParMetis was failing when I was running with a billion cells anyway).
- CMake no longer looks for ParMetis and it's been removed from the overview.
- Slight change to buffer processing: ID's in use sets are cleared at the end of timestep to prevent some rarely seen errors in debug mode