Develop multi model ensemble combination

See merge request external/cstools!27

1) function name CST_CategFc replaced with CST_CategoricalEnsCombination. 2) Additional dimension named member of size 1 added to output object to make it compatible with s2dv_cube requirements, 3) test function introduced with multiple tests, including test for dimension sizes and names, 4) documentation in CST_CategoricalEnsCombination adapted to change 2.

Fixes to Multieof

See merge request !34

Develop analogs

See merge request !25

CST_SaveExp saves a 's2dv_cube' object creating different files by start date

See merge request !30

Parallelization of the CST_RainFARM function and unit testing

See merge request !22

Answers to issues raised by Jost. Including Error catching when observational dataset is too small to make observational categories. Documentation adapted: 1) additional explnation on the obs method, 2) additional explanations on multiple models that have different ensemble members.

Adding Best Estimate Index methodology

See merge request !29