added label mechanics to isFlagged / implemented lebelMechanics test

Added label keyword mechanics to isFlagged (as discussed on the phone with @schaefed).

• Implementation is quite non-invasive.
• Biggest change: since history informations must be known to isFlagged - global, the histories get passed on to execGeneric (as opposed to only getting squeezed flags columns)
• added test

Test like so:

dat = pd.DataFrame({'data1': [1, 1, 5, 2, 1], 'data2': [1, 1, 2, 3, 4]}, index=pd.date_range('2000', '2005', periods=5))

qc = SaQC(dat)
qc = qc.flagRange('data1', max=4, label='out of range')
qc = qc.flagRange('data1', max=0, label='out of range2')
qc = qc.flagGeneric('data1', target='data2',func=lambda x: isflagged(x, 'out of range'))

Expected result is, that data2 only is flagged where first call to flagRange triggered flagging for data1.

closes #336 (closed)

requested review from @schaefed

assigned to @luenensc

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marked this merge request as draft

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• 69f404d4 - clean up/black

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• 69f404d4...90af9e8a - 6 commits from branch develop
• 57c1bc87 - Merge branch 'develop' into Make_isFlagged_testfunction_sensitive

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marked this merge request as ready

one more thing to discuss briefly is if we want to return the first or the last occurrence of label in the history..

from my guts, i vote for the last

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• b30cb26a - Applied suggestion

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• 68488530 - made it so that last occurence of label is selected

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