simplify/unify flags concatenation workflows

Implemented changes as suggested in #305 (closed)

• I have some problems figuring out the right way of squeezing flags as suggested in #305 (closed). I left a TODO note in the respective code line (funcs.resampling.concatFlags) and are requesting help from either one of you @palmb / @schaefed . (Or finlly a comprehensive documentation of the many pitfalls of history/flags object handling. I am really a bit lost any time i have to deal with those objects.)

added category: public API label

assigned to @schaefed

mentioned in issue #305 (closed)

requesting help from either one of you @palmb / @schaefed

Could you please support @palmb ? You are still the most competent Flags| History guy in the camp...

requested review from @palmb

mentioned in issue #320 (closed)

pls update the changelog. (i just made a thread with this, instead of a simple comment)

added 14 commits

• 0fa9813e...61395f93 - 12 commits from branch develop
• 4a354f61 - completed squeeze clause
• a8e0d0ed - Merge branch 'develop' into simplifyFlagsConcatenation

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added 1 commit

• 35d442dd - changelog modified

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added 1 commit

• 6e4f5a4c - ok

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added 1 commit

• 32764faf - ok

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added 1 commit

• 12df4ab9 - applied squeeze implementation suggestion

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added 31 commits

• 12df4ab9...f3784668 - 30 commits from branch develop
• ca9b4628 - solved MR in changelog

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resolved all threads