Merge branch 'fix/agipd_dark_retrieve_correct_old_constants' of ssh://git.xfel.eu:10022/detectors/pycalibration into fix/agipd_dark_retrieve_correct_old_constants

Same thing as for AGIPD.  Proposing to save this alongside the module mapping (if we're creating
YAML files per module anyway).  Note that I had to add "cap" and "qm" layers to old_const and
old_mdata; there's probably only one element in each, so the dictionary is overkill, but as we loop
over both, this would otherwise break if we ever have more than one of either...

This commit does too many things, sorry, but stuff was all tangled up:
- clean up a bit (imports, unused variables)
- map to PDU with one query instead of in loop (each query gets all anyway)
- start fetching old constants (for comparison) in the background
- add qm layer to dict holding old constants (see issue #49)

Merge branch 'feat/agipd-darks-save-old-const-paths' into fix/agipd_dark_retrieve_correct_old_constants

Use argparse only if name is main, call main with args dict

See merge request detectors/pycalibration!490

main function takes in `argv` as an optional argument and uses `sys.argv` if it is missing. This allows for easier testing.

Use full hostname for webservice overview

See merge request detectors/pycalibration!488

Fixes issues where the type to initialize Detector Constants differ in online and offline calibration. The enum themselves are used in offline calibration, while their string representation are used in the online calibration

Feat/user notebooks

See merge request detectors/pycalibration!466

slurm_calibrate.sh options

Main refactors are:
1- fstrings.  
2- Removing unused variables and imports.  
3- Remove code duplication for retrieving constants.  
4- Using pathlib.  
No changes have been done to the notebook functionality.  

See merge request detectors/pycalibration!477