TST: Tests and fix for unhandled data types in Excel writers.

Added tests and a fix for unhandled numpy data types in the
Excel writers. Issue #3122.
PERF: calling get_indexer twice when a specialized indexer (e.g. pad) could be called instead
Merge pull request #5178 from jreback/perf_reindex

PERF: calling get_indexer twice when a specialized indexer (e.g. pad) could be called instead
BUG: Fix segfault on isnull(MultiIndex)

Now raises NotImplementedError b/c not yet clear what it should return.
Merge pull request #5125 from jtratner/fix-segfault-mi-isnull

BUG: Fix segfault on isnull(MultiIndex)
TST: addtl pytables tests
Merge pull request #5180 from jreback/pytables_clean

TST: addtl pytables tests
DOC: multi-index update on cookbook.rst
fix replacement key for deprecated option `display.height`

replacement key for deprecated option `display.height` was set to `display.height` itself. I believe it should be `display.max_rows` instead.

This avoid a weird message in `describe_option()` :

    display.height: [default: 60] [currently: 60]
    : int
            Deprecated.
	    (Deprecated, use `display.height` instead.)
DOC/CLN: fix a few typos that were causing Sphinx warnings

Also clean up interpolate and a little bit rewording in bigquery docs
Merge pull request #5169 from cpcloud/doc-build-fixes

DOC/CLN: A few fixes and cleanup for doc warnings/errors
BUG: Allow duplicate indices when performing operations that align (GH5185)
CLN/BUG/ENH: Raise AttributeError with pd.options

It's called OptionError now and it subclasses both AttributeError (for
hasattr) and KeyError (for backwards compatibility). Hurray!
DOC: cleanups
Revert "DOC: cleanups"

This reverts commit bd1dbe7e0ee9db364a146eda74b0ddd050dd3903.
DOC: cleanups
Merge pull request #5188 from jtratner/fix-hasattr-on-options-object

CLN/BUG/ENH: Raise AttributeError with pd.options
ENH: Add date_format keyword to to_csv()

DOC: add date_format to release notes
DOC: minor whatsnew changes
Merge pull request #5187 from jreback/dup_ops

BUG: Allow duplicate indices when performing operations that align (GH5185)