BUG: Bug in Panel indexing with a list-like (GH8710)
ENH: add Index.is_monotonic_decreasing and Index.is_monotonic_increasing

Index.is_monotonic will have a performance degradation (still O(n) time) in
cases where the Index is decreasing monotonic. If necessary, we could work
around this, but I think we can probably get away with this because the fall-
back options are much slower and in many cases (e.g., for slice indexing) the
next thing we'll want to know is if it's decreasing monotonic, anyways.

see GH7860
ENH: support monotonic decreasing indexes in Index.slice_locs

also: NaN and NaT imply not monotonic
ENH/BUG: support Categorical in to_panel reshaping (GH8704)
CLN: move block2d_to_blocknd support code to core/internal.py
TST/BUG: support Categorical reshaping via .unstack
Merge pull request #8715 from jreback/panel_index

BUG: Bug in Panel indexing with a list-like (GH8710)
Merge pull request #8705 from jreback/to_panel

ENH/BUG: support Categorical in to_panel reshaping (GH8704)
Merge pull request #8680 from shoyer/reversed-monotonic-slices

ENH: slicing with decreasing monotonic indexes
ERR: leftover from renaming outtype to orient in to_dict
DOC: Select row with maximum value from each group
Merge pull request #8724 from unutbu/groupmax-recipe

DOC: Select row with maximum value from each group
COMPAT: Compat issue is DataFrame.dtypes when options.mode.use_inf_as_null is True (GH8722)
Merge pull request #8726 from jreback/inf

COMPAT: Compat issue is DataFrame.dtypes when options.mode.use_inf_as_null is True (GH8722)
Merge pull request #8721 from jorisvandenbossche/to_dict-invalid-orient

ERR: leftover from renaming outtype to orient in to_dict
ENH: read_csv dialect parameter can take a string (GH8703)
add release note