HiDEM v2.0.0

Version 2 of HiDEM:

Added

- Automatic computation of domain partitioning
- 'Run Name' parameter, appended to all output data
- 'Restart from Run Name' to make restarting easier
- 'Work Directory' and 'Results Directory' for organising output
- Synthetic test case

Changed

- Format of input file (now specified as "Param Name = Value" rather than ordered list)
- Reorganise code into directories (src, scripts, etc)
- Unhardcoded density, gravity, geometry input file, etc
- Convert most source from F77 to F90
- Move to semantic versioning (2.0 -> 2.0.0)