Some bug fixes for dynamic mu star calibration

[pat-schmitt]

• Tests added/passed

Some more bug fixes for run_dynamic_mu_star_calibration:

• now properly works with cfg.PARAMS['continue_on_error'] = True, meaning do not stop execution if run_dynamic_spinup entity_task raise an error, as error management is included in run_dynamic_mu_star_calibration
• fixed compatibility issue if different spinup strategies should be compiled together. The problem is that the fixed geometry spinup introduces an extra variable 'is_fixed_geometry_spinup' in the dataset, and to compile it together there is now an option to add this variable also to the dynamic spinup run
• there where an issue in calibrate_inversion_from_consensus if the user provides their own volume but there is no ITMIX volume available. Now the ITMIX volume is completely ignored if the user provides a volume.
• changed some variable names for more consistency between the two dynamic tasks