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)

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

See merge request detectors/pycalibration!475

Update author attribution on titlepage template

See merge request detectors/pycalibration!487

[AGIPD][darks] speed up darks processing

Closes #49

See merge request detectors/pycalibration!465

Fix/ CI failing tests

See merge request detectors/pycalibration!483

[webservice] fix/submit jobs for multiple detectors in the same run.

See merge request detectors/pycalibration!482

Use publicly released nbparameterise

See merge request detectors/pycalibration!480