This allows us to drop some crufty scripting and provides a firmer
footing for building better tools for preparing documents with source
code inside.

Also eliminate line numbers from the examples and text.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4650069

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4657071

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4673042

Also simplify the handling of keywords.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4639096

It's probably just an oversight that it doesn't work,
perhaps caused by analogy with Cap.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4634125

R=golang-dev, r, dsymonds
CC=golang-dev
https://golang.org/cl/4645078

R=rsc, mattn.jp
CC=golang-dev
https://golang.org/cl/4627065

R=rsc, julian
CC=golang-dev
https://golang.org/cl/4642049

This permits full URLs to be shown on the dashboard,
not just the repository roots.

This has been tested.

R=rsc, mattn.jp
CC=golang-dev
https://golang.org/cl/4627081

This changes Signature so that parsed signatures can be reserialized
exactly. With this ability we can add Serialize to Entity and also the
ability to sign other public keys.

R=bradfitz
CC=golang-dev
https://golang.org/cl/4627084

csv reader/writer based on RFC 4180

R=rsc, mattn.jp, r, dchest
CC=golang-dev
https://golang.org/cl/4629085

R=borman, bradfitz
CC=golang-dev
https://golang.org/cl/4654079

R=ken2
CC=golang-dev
https://golang.org/cl/4668049

R=golang-dev, m, rsc
CC=golang-dev
https://golang.org/cl/4639091

Fixes #1487.

R=rsc, alex.brainman, go.peter.90, mikioh.mikioh, mattn.jp
CC=golang-dev
https://golang.org/cl/4600042

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4667051

8c/gc.h:
. Added <u.h> header.
. Added "lD" pragma for "*Adr" to supplement "D".

8c/swt.c:
. Removed unreferenced "thestring" arguments in Bprint() calls.

cc/acid.c:
cc/com.c:
cc/com64.c:
cc/dcl.c:
cc/scon.c:
. Added <u.h>, required by "cc.h".

cc/bits.c:
. Added <u.h>, required by "cc.h".

cc/cc.h:
. Removed <u.h> and <ctype.h>.
. Added "O" pragma to accept "uint" as well as "int".
. Added new "U" pragma (char *).

cc/cc.y:
. Added <u.h> before <stdio.h> (and "cc.h").

cc/dpchk.c:
cc/mac.c:
. Added <u.h> and <ctype.h>.

cc/funct.c:
. Added <u.h>, required by "cc.h".

cc/godefs.c
. Added <u.h>, required by "cc.h".
. Dropped unused "t" argument in Bprint().

cc/lex.c:
. Added <u.h> and <ctype.h>.
. Removed unnecessary incrementation.
. Changed exit() invocations with exits().

cc/omachcap.c:
. Added <u.h>, required by "cc.h".
. USED(n) for unused argument to machcap().

cc/sub.c:
. Added <u.h> and <ctype.h>.

R=rsc
CC=golang-dev
https://golang.org/cl/4629070

R=rsc
CC=golang-dev
https://golang.org/cl/4643062

R=golang-dev, bradfitz, alex.brainman
CC=golang-dev
https://golang.org/cl/4635042

This implementation allows a goroutine to do successive acquisitions
of a mutex even if there are blocked goroutines.
Moreover, it allows a newcomer goroutine to acquire a mutex ahead of
blocked goroutines (that is, it does not enforce FIFO).
On implementation level it's achieved by separating waiter count and
locked flag.
Benchmark results on HP Z600 (2 x Xeon E5620, 8 HT cores, 2.40GHz)
are as follows (with 4631059 "replace Semacquire/Semrelease implementation"
patch applied):
benchmark                                        old ns/op    new ns/op    delta
sync_test.BenchmarkMutexUncontended                  24.10        25.40   +5.39%
sync_test.BenchmarkMutexUncontended-2                12.00        13.00   +8.33%
sync_test.BenchmarkMutexUncontended-4                 6.06         6.83  +12.71%
sync_test.BenchmarkMutexUncontended-8                 3.63         3.60   -0.83%
sync_test.BenchmarkMutexUncontended-16                2.38         2.49   +4.62%

sync_test.BenchmarkMutex                             25.00        26.40   +5.60%
sync_test.BenchmarkMutex-2                          231.00        49.00  -78.79%
sync_test.BenchmarkMutex-4                          259.00       114.00  -55.98%
sync_test.BenchmarkMutex-8                          641.00       110.00  -82.84%
sync_test.BenchmarkMutex-16                        1380.00        96.30  -93.02%

sync_test.BenchmarkMutexSlack                        24.80        26.20   +5.65%
sync_test.BenchmarkMutexSlack-2                     210.00       106.00  -49.52%
sync_test.BenchmarkMutexSlack-4                     453.00       119.00  -73.73%
sync_test.BenchmarkMutexSlack-8                    1024.00       105.00  -89.75%
sync_test.BenchmarkMutexSlack-16                   1291.00        91.90  -92.88%

sync_test.BenchmarkMutexWork                        796.00       796.00   +0.00%
sync_test.BenchmarkMutexWork-2                      399.00       401.00   +0.50%
sync_test.BenchmarkMutexWork-4                      216.00       212.00   -1.85%
sync_test.BenchmarkMutexWork-8                     1547.00       196.00  -87.33%
sync_test.BenchmarkMutexWork-16                    2754.00       287.00  -89.58%

sync_test.BenchmarkMutexWorkSlack                   792.00       800.00   +1.01%
sync_test.BenchmarkMutexWorkSlack-2                 430.00       420.00   -2.33%
sync_test.BenchmarkMutexWorkSlack-4                 467.00       230.00  -50.75%
sync_test.BenchmarkMutexWorkSlack-8                1860.00       273.00  -85.32%
sync_test.BenchmarkMutexWorkSlack-16               3029.00       294.00  -90.29%

R=rsc
CC=golang-dev
https://golang.org/cl/4631075

Except for the inevitable bug fixes, the Regexp code is done.

R=sam.thorogood, r
CC=golang-dev
https://golang.org/cl/4635082

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4629084

R=nigeltao
CC=golang-dev
https://golang.org/cl/4636067

This change extends goinstall to support "magic" package names of the
form:
        <host>/<repo>.<vcs>/<path>

Where <host> is the hostname, <repo> the path to the repository, <vcs>
the type of vcs (git, hg, bzr or svn), and <path> is the path inside the
repository that contains the source code for the package.

For example: "example.com/pub/foo.hg/src" means download the Mercurial
repository at either pub/foo.hg or pub/foo from example.com and then
build and install the source files from src inside the repository
checkout.

Repositories on the built-in hostings sites (github, bitbucket,
launchpad and googlecode) must still use the old form (i.e.
github.com/xxx/yyy.git/src will be rejected).

R=adg, rsc
CC=golang-dev
https://golang.org/cl/4626064

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4650062

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4625078

Fixes #2026.

R=bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4645074

No API or functional change.

R=jacek.masiulaniec, mikioh.mikioh, rsc
CC=golang-dev
https://golang.org/cl/4630081

Fixes #2024

R=adg, dsymonds
CC=golang-dev
https://golang.org/cl/4635083

Open is more likely to be present than Syscall.

R=rsc
CC=golang-dev
https://golang.org/cl/4645073

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4635081

R=rsc
CC=golang-dev
https://golang.org/cl/4634113

R=rsc, r, bsiegert
CC=golang-dev
https://golang.org/cl/4643058

Fixes #2025.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4636075

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4634112

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4630080

R=r
CC=golang-dev
https://golang.org/cl/4626085

Each package using struct field tags assumes that
it is the only package storing data in the tag.
This CL adds support in package reflect for sharing
tags between multiple packages.  In this scheme, the
tags must be of the form

        key:"value" key2:"value2"

(raw strings help when writing that tag in Go source).

reflect.StructField's Tag field now has type StructTag
(a string type), which has method Get(key string) string
that returns the associated value.

Clients of json and xml will need to be updated.
Code that says

        type T struct {
                X int "name"
        }

should become

        type T struct {
                X int `json:"name"`  // or `xml:"name"`
        }

Use govet to identify struct tags that need to be changed
to use the new syntax.

R=r, r, dsymonds, bradfitz, kevlar, fvbommel, n13m3y3r
CC=golang-dev
https://golang.org/cl/4645069

R=rsc, alex.brainman, hectorchu, r
CC=golang-dev
https://golang.org/cl/3759042

Fixes #1971.

R=adg, rsc
CC=golang-dev
https://golang.org/cl/4630056