net/http: better stand-alone FileServer doc example

Motivated by a deletion in the wiki, which had a better
example.

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/8288045
net/http: remove some obsolete TODOs

We've decided to leave logging to third-parties (there are too
many formats), which others have done.

And we can't change the behavior of the various response
fields at this point anyway. Plus I argue they're correct and
match their documention.

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/8391043
godoc: enable visibility of element linked from URL hash

Expands the example when visiting a URL such as
http://golang.org/pkg/net/http/#example_Hijacker

Fixes issue 5212.

R=golang-dev, bradfitz, adg
CC=golang-dev
https://codereview.appspot.com/8378043

Committer: Andrew Gerrand <adg@golang.org>
runtime: use a distinct pattern to mark free blocks in need of zeroing

R=golang-dev, dvyukov, khr, cshapiro
CC=golang-dev
https://codereview.appspot.com/8392043
strconv: remove some test TODOs and adjust malloc limits lower

These no longer allocate.

R=golang-dev, dave
CC=golang-dev
https://codereview.appspot.com/8340047
testing: structure package documentation

Makes finding the relevant information much easier.

R=golang-dev, adg
CC=golang-dev
https://codereview.appspot.com/8353045

Committer: Andrew Gerrand <adg@golang.org>
cmd/gc: fix Offsetof computation.

The offset of an embedded field s.X must be relative to s
and not to the implicit s.Field of which X is a direct field.
Moreover, no indirections may happen on the path.

Fixes issue 4909.

R=nigeltao, ality, daniel.morsing, iant, gri, r
CC=golang-dev
https://codereview.appspot.com/8287043