add function to get variant-label from path where r/I/p1/f are 0

[paolap]

We found a model that have wrong r/I/p and f values in their attributes.
Would be good to double check that variant label built from these is the same as path.

We could run these checks for all records or simply doing it when values are 0 or potentially missing as in the example

:initialization_index = 0 ;
:physics_index = 0 ;
:realization_index = 0 ; " ;
:forcing_index = 2 ;
variant-label here is r1i1p1f2

I can do this relatively easily if the record hasn't been excluded already.
I.e. this will fix returning the wrong member_id if you haven't use member-id as one of the selecting fields. If you use it as one of the selecting files however the record simply won't be returned by the database and there's nothing for clef to work one.
The only solution for that would be running the query without member_id first, correct the records (if nay) and then filter after that

[paolap]

In commit b64601b , branch label check, it is fixing both varian_label and member_id so they appear correct at least in csv files
variant-label could be different if sub-experiment present but since this is fixing errors in files the likelihood of this happening for sub-experiments is currently very low.

[paolap]

this is available in release 1.2.1