Aggregation issue for seasonal indices and cell methods etc.
Metadata for seasonal indices appears to be spread out in several issues. This issue is just to collect these into one:
Focus on cell methods produced by climix
- #52 Correctly implement cell_methods
- #193 Non-CF cell methods should be empty
- #246 cell_methods for seasonal indices
Focus on clix-meta --> climix interface
- #95 annual indices based on part of the year are not seasonal
- #170 Mechanism to specify user defined seasons in the master table
Focus on index definition in clix-meta
- clix-meta #29 Clarify description of period