BUG: union should not try to sort inplace because platform impls differ as to when sorting occurs for objects that cannot be compared
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
BUG StringMethods on empty series (GH7242)

- all StringMethods are tested and work on empty seires
- moreover extract always returns dtype==object, even when no match is
  found