BUG: scatter_plot ranges are unaligned among subframes GH5497
Merge pull request #5665 from acorbe/scatter_matrix_off_diagonal_aligned
BUG: Regression in Series with a multi-index via ix (GH6018)
CLN: Remove references to _SeriesIndexer (vestigial)
BUG/CLN: make xs a generic method
Merge pull request #6022 from jreback/series_mi

BUG: regression in GH6018, indexing with a Series multi-index
API: Add equals method to NDFrames. (Implemented with `array_equivalent`, which
    is similar to `np.array_equal` except that it handles object arrays and
    treats NaNs in corresponding locations as equal.