ENH: Add wide_to_long helper function.
ENH: Allow non-int j vals
DOC: Add wide_to_long to release notes.
CLN: expand groupby dispatch whitelist (GH5480)

- Create separate whitelists for SeriesGroupBy and DataFrameGroupBy objects
- Improve groupby whitelist testing
Merge pull request #5525 from PKEuS/master

StataWriter: Replace non-isalnum characters in variable names by _ inste...
BUG: mixed column selection with dups is buggy (GH5639)
Merge pull request #5640 from jreback/dups_bool

BUG: mixed column selection with dups is buggy (GH5639)
Revert "StataWriter: Replace non-isalnum characters in variable names by _ instead of integral represantation of replaced character. Eliminate duplicates created by replacement."

Fails under py2.6 / win32 because of unicode issues

This reverts commit c57363072acec8138381d033b9b7cb7fcfc575a9.
TST: prevent stderr from leaking to console in util.testing
Merge pull request #5644 from y-p/PR_popen_noise_on_error

TST: prevent stderr from leaking to console in util.testing
BLD: remove ISRELEASED tag from setup.py
BUG: repr_html, fix GH5588 for the MultiIndex case
VB: add vbench for truncated repr_html
Merge pull request #5649 from y-p/PR_GH5588_again

BUG: repr_html, fix GH5588 for the MultiIndex case
DOC: minor changes in .apply section
DOC: SQL to pandas comparison (#4524)
TST: Always define fd in util/testing
DOC: cookbook update
DOC: Series.rename picking up the wrong docstring
PERF: performance regression in frame/apply (GH5654)