Switching to python3 and removing some old/unfinished bits#24

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stalbrec wants to merge 8 commits intoUHH2:htcondorfrom

stalbrec:speedup

Commits on Nov 8, 2022

fixes most of linting, while cleaning up and started to make code py3 compatible
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removing unfinished Database feature
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moving check_TreeExists to io_func.py to reduce number of files
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switching to py3 and using uproot instead of pyROOT
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adding wrapper script that creates minimal py3 venv in order to be able to run sframe_batch.py in CMSSW-env that is still using py2
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fixing resubmission (not getting LD_LIBRARY_PATH but rather *_BACKUP)
stalbrec
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fix forgotten py2->py3 conversions and lint fixing
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fix batch_classes
stalbrec
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