TST: fix undefined variables hidden by unintended test method shadowing
BUG/TST raise a more detailed error when GH6169 occurs, added a test

Raise a detailed error when a `columns` argument is passed through 'where' to
select a multiIndexed Dataframe from an HDF store. Wrote a test
showcasing the bug

	modified:   pandas/io/pytables.py
	modified:   pandas/io/tests/test_pytables.py

making it work
BUG: correctly select on a multi-index even in the prescence of under specificed columsn spec (GH6169)
Merge pull request #6202 from jreback/mi_hdf

BUG: correctly select on a multi-index even in the prescence of under specificed column spec (GH6169)
Merge pull request #6184 from dsm054/fix-test-reshape

TST: fix test_reshape.py
DOC: styling clean-up of docstrings (part 2: series and generic.py)
BUG: bug in nanops.var with ddof=1 and 1 elements would sometimes return inf
     rather than nan on some platforms (GH6136)
Merge pull request #6206 from jorisvandenbossche/docstring-numpydoc-cleanup

DOC: styling clean-up of docstrings (part 2: series and generic.py)
Merge pull request #6204 from jreback/var_ddof

BUG: bug in nanops.var with ddof=1 and 1 elements would sometimes return inf rather than nan (GH6136)
Fix typo in Melt section
BUG: dont ignore use_index kw in bar plot
DOC use read_sql rather than read_frame in io.rst
Merge pull request #6211 from Bklyn/doc-fix

DOC: Fix typo in Melt section
BLD: more exception message skipping in @network
BLD/DOC: make.py open file as 'w' rather then 'wb'
BLD/DOC: ip_directive use py3 compat text_type
CLN: typo
Merge pull request #6210 from TomAugspurger/bar-use_index

BUG: dont ignore use_index kw in bar plot
ENH/DOC: add params to `DataFrame.to_csv` GH5414 GH4528

- Add `quotechar`, `doublequote`, and `escapechar` parameters
- Add tests for each new param
- Update relevant docs