time: deal a bit better with time zones in Parse
* Document Parse's zone interpretation.
* Add ParseInLocation (API change).
* Recognize "wrong" time zone names, like daylight savings time in winter.
* Disambiguate time zone names using offset (like winter EST vs summer EST in Sydney).
The final two are backwards-incompatible changes, but I believe
they are both buggy behavior in the Go 1.0 versions; the old results
were more wrong than the new ones.
Fixes #3604.
Fixes #3653.
Fixes #4001.
R=adg
CC=golang-dev
https://golang.org/cl/
7288052