BUG: Fix to_datetime to properly deal with tz offsets #3944

Currently for certain formats of datetime strings, the tz offset will
just be ignored.
DOC: Clarify that DataFrame string formatters must return strings

I am not 100% sure that string formatters must really return *unicode* strings
(non-unicode strings seem to work, too), but I am leaving that because it's
what is already documentated.

Fixes #6052.
ENH: allow legend='reverse' in df.plot() GH6014
CLN: fix ScatterCI links in README and rnotes
CLN: convert test docstring to comment
BLD/TST: catch more spurious errors in @network decorator
Merge pull request #6151 from y-p/PR_network

BLD/TST: catch more spurious errors in @network decorator
BLD/TST: one more skip_errno for @network
BUG: fix loc setitem with a dataframe on rhs, multiple items, and a datetimelike (GH 6152)
Merge pull request #6152 from jreback/loc

BUG: fix loc setitem with a dataframe on rhs, multiple items, and a datetimelike
BLD/TEST: @network, SkipTest on known errnos
PERF: perf regression index construction from seris (GH6150)
Merge pull request #6153 from jreback/index_perf

PERF: perf regression index construction from series (GH6150)
TST: rec arrays don't support datetimes in creation on certain platforms, related (GH6140)
TST: dtype comparison issue on windows for (GH6152)
Merge pull request #6156 from jreback/sparc_fix4

TST: rec arrays don't support datetimes in creation on certain platforms, related (GH6140)
Updated docs to reflect a pagination bug that was fixed. Closes: issue #6096
Merge pull request #6157 from jacobschaer/master

Updated docs to reflect a pagination bug that was fixed. Closes: issue #6068
BUG: allow lex string comparisons
Merge pull request #6158 from cpcloud/eval-fix-str-lexico

BUG: allow lex string comparisons