TST: tests for Index.insert to validate neg/pos indexers (GH7256)
TST: Use ISO8601 format for DTI partial slicing
Merge pull request #7290 from sinhrks/gh7289

TST: Use ISO8601 format for DTI partial slicing
Update workflow on documenting changes

Only in whatsnew and no longer also in release.rst
TST: fix intermittent dict_complex test failures

`test_dict_complex` and `test_dict_numpy_complex` would give occasional
test failures on Python 3.4.  The test was written to depend on the
order of values from `dict.values()`; remove that dependency.

Closes gh-7293.
Merge pull request #7298 from matthew-brett/fix-dict-complex-failures

TST: fix intermittent dict_complex test failures
CLN/TST remove compat.scipy.rankdata and update tests with sp.stats.rankdata. Move percentileRank to stats.misc, delete compat.scipy
updated spacing in test_series