BUG:Time Grouper bug fix when applied for list groupers#17587

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ruiann:time_grouper

Oct 1, 2017

Commits on Oct 1, 2017

use grouper if given the list if grouper

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BinGrouper holds the sorted binners, give the indexer to reorder axis if needed, eg. build grouping labels

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PEP8 fix

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PEP8 & comment

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comment

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new method for BaseGrouper and inherited class

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comment

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move test to test time grouper

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update whatsnew entry

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fixups
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