Automatically update tolerances in testsuite #298
Description
Currently the tolerances for each parameter have to be edited by hand.
This is cumbersome and a waste of time.
Furthermore it makes it hard to reset the thresholds after a new ref has been uploaded.
Implement a tuning mechanism in https://github.com/C2SM/extpar/blob/master/test/testsuite/src/checkers/tolerance_check_cdo.py to achive that.
For cosmo this tuning option has been in place, I think here: https://github.com/C2SM/extpar/blob/master/test/testsuite/src/checkers/output_tolerance_check.py