DOC: tweak ecosystem section
DOC: tweak ecosystem section
BLD: fix cythonized msgpack extension in setup.py GH5831
Merge pull request #5838 from danielballan/extract-docstring

DOC: minor fix in extract docstring
ENH: Improve error message for PeriodIndex to infer_freq. Closes #5841.
Add pandas cookbook to tutorials (for #5837)
BUG: Bug in selection with missing values via .ix from a duplicate indexed DataFrame failing (GH5835)
Merge pull request #5847 from jseabold/fix-5841

ENH: Improve error message for PeriodIndex to infer_freq. Closes #5841.
Merge pull request #5849 from jreback/dup_selection

BUG: Bug in selection with missing values via .ix from a duplicate indexed DataFrame failing
BUG: fix issue of boolean comparison on empty DataFrames (GH5808)
Merge pull request #5810 from jreback/bool_ops

BUG: fix issue of boolean comparison on empty DataFrames (GH5808)
ENH: Refactor code to add is_view method for Series.
DOC: Add is_view to release notes
Merge pull request #5853 from jseabold/add-is-view-series

ENH: Refactor code to add is_view method for Series.
DOC: release notes
DOC: release notes
Revert "DOC: release notes"

This reverts commit 8788aff6d8b6e50c2b1252da36dfe9f4d24e3168.
Revert "DOC: release notes"

This reverts commit 2a8cd09acbe78e5b325f14082de2b0b496af2747.
Revert "Merge pull request #5853 from jseabold/add-is-view-series"

Following discussion in GH5853, reverting the change to revisit
in 0.14.

This reverts commit 91d6f1bb98a439687a31880cfcc8431d12d077c6, reversing
changes made to ee92c756f06b31efbf636185e8c2b4a5e607e808.
BUG: Series.sort will raise a ValueError (rather than a TypeError) on sorting an
     object that is a view of another (GH5856`, GH5853)

API: DataFrame._ixs will properly record a cache change (similar to _get_item_cache)