ENH: Make it possible to pass files in any order and guess the variables to be used

[bzah]

• icclim version:
• Python version:

Description

It would be nice if icclim could guess which variable to use when given a list of files and the index expected variable is known.
for example, fetch tasmax in files if computing SU.

[bzah]

@pagecp, I fogot about it but, it's already implemented.
You can run
icclim.cw(["pr.nc", "tas.nc"]) and it will work whatever is the order of the two files as long as a pr (or its aliases) and a tas (or its aliases) is found in the merged Dataset.
I could not find this in the documentation though, I will keep this issue open to update the doc.