Ability to specfify 2D and 3D grids to read
In order to read gridded meteo parameters, the ability to generically specify grids to read is needed. The following solution should work:
- we keep the read2Dgrid(grid, filename) since force-reading a given file will always be useful
- we add read2Dgrid(grid, date, MeteoParam). Then each plugin would build the necessary file name / db field with this information
The same thing would be done for 3D grids (we should implement square 2 D cell with different heights, per layer, since most models use this representation (Cosmo, Arps))