Remove number of deprecated parameters/functions/classes [fix #6641]
DOC: updates to indexing.rst / chained indexing docs
DOC: add performance section to io.rst
DOC: v0.14.0 updates
DOC: add space considerations to IO methods in performance section
BUG: fix replace bug where different dtypes in a nested dict would only replace the first value
Merge branch 'fix6641_pr' of https://github.com/jsexauer/pandas into jsexauer-fix6641_pr

Conflicts:
	doc/source/v0.14.0.txt
Merge pull request #6820 from cpcloud/replace-dtype-bool-fix

BUG: fix replace bug where different dtypes in a nested dict would only replace the first value
DEPR:  Deprecate DateRange [fix #6816]
Additional documentation for holiday calendars and minor correction to start/end date logic.
Merge pull request #6840 from rockg/holiday-doc

Additional documentation for holiday calendars
DOC: Use correct git hub numbers for deprecations [#6641]
Merge pull request #6844 from jsexauer/fixDoc6813

DOC: Use correct git hub numbers for deprecations [#6641]
DOC: minor formatting corrections in v0.14.0 / release
ERROR: better expection for passing a MS frequency (GH5332)
TST: correction for freq in GH5332
API/BUG Raise ValueError when stacking nonunique levels

Should raise a ValueError when (un)stacking a DataFrame
on a nonunique level. Previous behavior was to raise
a KeyError (not deliberately). Closes #6729.