archive/tar: Add reader and writer code example.

Remove the previous comment examples.

R=golang-dev, minux.ma, adg
CC=golang-dev
https://codereview.appspot.com/7220048

Committer: Andrew Gerrand <adg@golang.org>
net: prevent races during windows lookup calls

This only affects code (with exception of lookupProtocol)
that is only executed on older versions of Windows.

R=rsc, bradfitz
CC=golang-dev
https://codereview.appspot.com/7293043
archive/tar: add Copyright notice to example_test.go

R=golang-dev, mikioh.mikioh
CC=golang-dev
https://codereview.appspot.com/7278050
time: handle zone file with no transitions

Code fix by Alex Bramley.

Fixes issue 4064.

R=golang-dev, adg
CC=golang-dev
https://codereview.appspot.com/7289049
C: add Alex Bramley (Google CLA)

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/7284047
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 issue 3604.
Fixes issue 3653.
Fixes issue 4001.

R=adg
CC=golang-dev
https://codereview.appspot.com/7288052
regexp: add (*Regexp).Longest

Fixes issue 3696.

R=rsc
CC=golang-dev
https://codereview.appspot.com/7133051
container/heap: fix package doc comment about ordering.

R=gri, rsc
CC=golang-dev
https://codereview.appspot.com/7280044
cmd/go, testing: revise docs for test flags

In cmd/go's 'go help testflag':
* Rewrite list of flags to drop test. prefix on every name.
* Sort list of flags.
* Add example of using -bench to match all benchmarks.

In testing:
* Remove mention of undefined 'CPU group' concept.

Fixes issue 4488.
Fixes issue 4508.

R=adg
CC=golang-dev
https://codereview.appspot.com/7288053
regexp: update comment on (*Regexp).Longest

Missed this review comment.

R=golang-dev, rsc
CC=golang-dev
https://codereview.appspot.com/7229084
time: fix error message from Parse

Was incorrectly discarding the offending text in some cases.

Fixes issue 4493.

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/7277050
runtime/debug: add controls for garbage collector

Fixes issue 4090.

R=golang-dev, iant, bradfitz, dsymonds
CC=golang-dev
https://codereview.appspot.com/7229070
net: use windows sysSocket everywhere

R=golang-dev, bradfitz, dave
CC=golang-dev
https://codereview.appspot.com/7273046
cmd/gc: fix &^ code generation bug

Was not re-walking the new AND node, so that its ullman
count was wrong, so that the code generator attempted to
store values in registers across the call.

Fixes issue 4752.

R=ken2
CC=golang-dev
https://codereview.appspot.com/7288054