handle start/stop in remove, delete and select_coords
implemented unit test for start/stop in remove
BUG/CLN: MI now checks level & label compatibility

Via verify_integrity kwarg. Internals all pass False.

CLN: Verify integrity by default on label/level setting
Merge pull request #5214 from jtratner/mi-validate-level-label-compat

BUG/CLN: MI now checks level & label compatibility
CLN: Add _reset_cache method to PandasObject
CLN/ENH: Make names getattr'able in core/ops +PEP8.

Now the name passed to a method can be used to get that method from the
NDFrame (previously you had things like `or_ [|]`. better to just have
them all be named exactly what they are s.t. subclasses can do
`getattr(super(self, MyClass), name)(*args, **kwargs)`.
reopening store if it get closed during iteration
fixed append for dataframe with multiindex
Merge branches 'remove-startstop-fix', 'append-mutli-fix' and 'select-iter-recusive'
Fixed assertion error message
Merge branch 'master' of https://github.com/pydata/pandas
DOC: fix building of gbq docs
Merge pull request #5242 from ojh/master

Fixed assertion error message
Merge pull request #5241 from jorisvandenbossche/docs-gbq-fixes2

DOC: fix building of gbq docs
API: default export for to_clipboard is now csv (GH3368)
ENH: Add usecols option to python parser.

Closes #4335

Added release note and fixed py3 compat

Updated docs for consistency
Merge pull request #5070 from jreback/clip

API: default export for to_clipboard is now csv (GH3368)
TST: Added test for Excel writers with duplicated column names.

Test for issue #5235
Merge branch 'tst_excel_duplicated_cols' of https://github.com/jmcnamara/pandas into jmcnamara-tst_excel_duplicated_cols
API: add excel kw to to_clipboard to preserve compat behavior (related GH5070)