FIX raise when groupby selecting cols not in frame
ENH partial sorting for mi in sortlevel
DOC partial sort for multiindex
CLN: simplify series plotting
BUG: Groupby.get_group doesnt work with TimeGrouper
COMPAT: change neg of boolean to inv (deprecation in numpy 1.9)
COMPAT: remove deprecation warnings on __new__ (in computation/pytables)
ENH: Added NDFrame.slice_shift

added slice_shift func docs and removed freq argument
BUG: Change Panel.shift to use slice_shift #6605 #6826

TST: Make sure Panel.shift retains dtypes

DOC: removed previous doc entries for #6605

Re-add note about dropping shifted periods

DOC: added note about bug fix

don't pass on freq
COMPAT: windows dtype fix in for Panel.count
Merge pull request #6981 from pydata/winfix

COMPAT: windows dtype fix in for Panel.count
TST: windows dtype fix for test_pivot (GH6913)
COMPAT: fix array_to_datetime on comparison of NaT
COMPAT: fix warning for slice indexers when using floats in iloc that are convertible
Merge pull request #6960 from jreback/warnings

COMPAT: fix numpy 1.9-dev deprecation warnings in test suite
TST: test_frame/test_sum not comparing correctly on smaller sized dtypes (GH6982)
COMPAT: remove deprecated options from printing in test suite (GH6984)
Merge pull request #6986 from jreback/warnings2

COMPAT: remove deprecated optinos from printing in test suite (GH6984)
PERF: improved performance of compatible pickles (GH6899)
Merge pull request #6983 from jreback/pickle_perf

PERF: improved performance of compatible pickles (GH6899)
Merge pull request #6985 from jreback/test_sum

TST: test_frame/test_sum not comparing correctly on smaller sized dtypes (GH6982)