Mpes tweaks

[rettigl]

Some further improvements for the mpes workflow an loader

[coveralls]

Pull Request Test Coverage Report for Build 6421333972

• 50 of 52 (96.15%) changed or added relevant lines in 4 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 90.556%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
sed/core/processor.py	1	2	50.0%
sed/loader/mpes/loader.py	21	22	95.45%

Files with Coverage Reduction	New Missed Lines	%
sed/calibrator/energy.py	2	91.86%

Totals
Change from base Build 6285960524:	0.03%
Covered Lines:	4219
Relevant Lines:	4659

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💛 - Coveralls

[rettigl]

This PR contains a few usefull additions mostly for mpes:

• print some output from the correction workflows into widgets, as normal output is not shown in jupyter lab after a cell has been executed
• revert the momentum correction back before successive application of pose corrections
• add "runs" implementation for the mpes loader
• add option to pass a eln file to the nexus converter, without providing the complete file list

I want to merge it before it grows any bigger yet, a review should be still quick and feasible.

[steinnymir]

Looks like mostly MPES related changes, so nothing against that.
Only wondering why limiting the jupyter version.