API: raise SettingWithCopy when chained assignment is detected
DOC: remove docstring of flags attribute during doc building process (#5331)
Merge pull request #5450 from jorisvandenbossche/docs-flags-remove-docstring

DOC: remove docstring of flags attribute during doc building process (#5331)
DOC: small error in cookbook (doc build warning)
Merge pull request #5454 from jorisvandenbossche/patch-1

DOC: small error in cookbook (doc build warning)
BUG: Excel writer doesn't handle "cols" option correctly

Added fix to ensure that Series associated with column
names are handled correctly even if names are duplicated
or swapped. Issue #5427
Merge pull request #5429 from jmcnamara/bug_excel_cols_option

BUG: Excel writer doesn't handle "cols" option correctly
Merge pull request #5390 from jreback/chained

API: raise/warn SettingWithCopy when chained assignment is detected
BUG: pd.to-timedelta handles missing data
Merge pull request #5438 from danielballan/to-timedelta-missing-data

BUG: pd.to_timedelta handles missing data
add optional default value to GroupBy.get_group
add test cases to test_groupby for GroupBy.get_group with a default value
make try except block python3 compatible
change test_groupby as per @jreback's suggestion
fix last commit
replace strange [False] * len(wp) with more natural wp.month == -1
Merge branch 'get_group_default' of github.com:dwiel/pandas into get_group_default