BUG: union should not try to sort inplace because platform impls differ as to when sorting occurs for objects that cannot be compared
CLN/DOC: Remove trailing whitespace from .rst files in doc folder
Merge pull request #7317 from bwignall/doc-trailingws

CLN/DOC: Remove trailing whitespace from .rst files in doc folder
BUG: inferred_freq results in None for eastern hemispheres timezones
DOC: cookbook addition
CLN/DOC: Change instances of "Pandas" to "pandas" in documentation
Merge pull request #7305 from bwignall/pandas-cap

CLN/DOC: Change instances of "Pandas" to "pandas" in documentation
Merge pull request #7318 from sinhrks/infer

BUG: inferred_freq results in None with eastern hemisphere timezones
Merge pull request #5266 from cpcloud/index-fix-sort-union-5039

BUG: union should not try to sort inplace because platform impls differ as to when sorting occurs for objects that cannot be compared
implement additional tests for groupby apply methods
simplify groupby's std method
add sem to nanops
add sem to aggregate methods
add sem to groupby
add sem to docs