BUG: single group series should preserve group name
Merge pull request #7313 from cpcloud/fix-single-group-extract

BUG: single group series should preserve group name
BUG: do not check that val != val and not equal inf/-inf since by def val not eq val is nan
Merge pull request #7315 from cpcloud/fix-dropna-with-inf-7314

BUG: isnull doesn't properly check for inf when requested
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