General fixes bis#109

Merged

sborms merged 11 commits intodevelopfrom

general-fixes-bis

Oct 1, 2021

Commits on Sep 30, 2021

ffselection not on train data
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fix train-selection split ffs
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some cleaning
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Commits on Oct 1, 2021

cleaning
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Merge branch 'develop' into general-fixes-bis
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final PIG plots tweaks
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finetune ffs & tutorials
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add comma
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rotation=45
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integrating comments Sander & finetuning
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unit testing ffs assertions
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