ENH: HDFStore.flush() to optionally perform fsync (GH5364)
DOC: Modifications to documentation following PR 5369 review.
TST: Modifications to unit test following PR 5369 review.
TST: Better handle np.array_equal() edge cases
BUG: Make sure that head/tail are iloc based, (GH5370)
Merge pull request #5373 from jreback/float_index

BUG: Make sure that head/tail are iloc based, (GH5370)
Merge pull request #5369 from benalexau/master

ENH: HDFStore.flush() to optionally perform fsync (GH5364)
Merge pull request #5371 from jtratner/catch-errors-array-equal

TST: Better handle np.array_equal() edge cases
ER/API: unicode indices not supported on table formats in py2 (GH5386)
Merge pull request #5387 from jreback/hdf_index_tests

ER/API: unicode indices not supported on table formats in py2 (GH5386)
DOC: minor io.rst updates / cookbook.rst
fixing https://github.com/pydata/pandas/issues/5372
ENH/CLN: Redefine str.match, and issue a warning on deprecated default behavior.
BUG: groupby with a Float like index misbehaving when the index is non-monotonic (related GH5375)
Merge pull request #5393 from jreback/groupby_iloc

BUG: groupby with a Float like index misbehaving when the index is non-monotonic (related GH5375)
DOC: Expanded section on string methods in wake of extract/match change.
Merge pull request #5376 from RomanPekar/periodIndex-repr

repr for PeriodIndex does not handle <=2 elements well (GH5372)
CLN: Minor touchups to docstrings + use assert_produces_warning
Merge pull request #5224 from daniel-ballan/redefine-match
BUG/TST: transform and filter on non-unique index, closes #4620