FIX raise when groupby selecting cols not in frame
ENH partial sorting for mi in sortlevel
DOC partial sort for multiindex
add bins argument to histogram

add bins to histrogram
CLN: failing test on 2.6/windows re GH6866, CustomBusinessMonth
DOC: release/v0.14.0.txt edits
Merge pull request #6850 from zachcp/histograms

DOC: add bins argument to Histogram function
BUG: pass bins arg in hist_frame
Merge pull request #6935 from TomAugspurger/hist-fix

BUG: pass bins arg in hist_frame
API: change AssertionError to TypeError for invalid types passed to concat (GH6583)
REGR: TextFileReader in concat, which was affecting a common user idiom (GH6583)
Merge pull request #6941 from jreback/concat

REGR/API: accept TextFileReader in concat (GH6583)
BUG/ENH: Warn when falling back to python parser

-raise ValueError when engine='c' specified with unsupported options
-raise ValueError when fallback to python causes options to be ignored
-produce ParserWarning on fallback to python when no options ignored
-fix bug in C parser with leading whitespace and \r-delimited files
 (add test)
-translate sep='\s+' to delim_whitespace=True (add test)
-raise ValueError if the user specifies both `sep` and
 `delim_whitespace=True`
-specify engine='python' in tests with sep='\s+' and multiindex column
 input (work around GH 6893)
-add 'engine' option to docstring of read_csv and read_table
-copy tests that previously fell back to python from ParserTests to
 TestPythonParser and check that they raise ValueErrors when run
 under other engines
Merge pull request #6889 from mcwitt/fix-gh6607

BUG/ENH: Add fallback warnings and correctly handle leading whitespace in C parser
BUG: Series/DataFrame.rank() doesn't handle small floats correctly #6868

adding test for ranking with np.inf

Added release note #6886

Fixing float conversions in test_rank()
Update indexing.py

Adding a space
Merge pull request #6946 from ribonoous/patch-1

Update indexing.py
BLD: add excel deps to 2.6 build
BUG: Fix to read decimal seconds from Excel.

Fix to allow decimal seconds to be read from Excel dates and times
into datetime objects. #5945.
Merge pull request #6934 from jmcnamara/bug_decimal_seconds

BUG: Fix to read decimal seconds from Excel.
CLN: simplify series plotting