Add redproc flag

Description

If a flag redproc: true is set in the calibration configuration for the proposal, either on the correct level or on the instrument level, then the output directory is changed from proc to redproc.

How Has This Been Tested?

🤔 has not, will add unit tests if there is time.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the code style of this project.
• I added tests where appropriate.

Reviewers

@schmidtp @esobolev

I talked to Egor about this yesterday and, if I understood right, it would be useful to have this configurable per instrument as well, which is why the check for the flag is at both correct: redproc and correct: $INSTRUMENT: redproc.