BUG: TimeGrouper sortedness / API fix (GH4161,GH3881) #6350
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BUG: Bug in TimeGrouper/resample when presented with a non-monotonic DatetimeIndex would return invalid results,
BUG: Bug in index name propogation in TimeGrouper/resample
closes #4161
API: TimeGrouper has a more compatible API to the rest of the groupers (e.g.
groupswas missing)closes #3881