Due to removal of go_tutorial, unused programs are removed.
        makehtml is unnecessary (it also gives wrong messages when
        the destination file doesn't exist)
        progs/run now compiles all remaining programs under doc/progs.
        Fixes #3076 (again)

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5755053

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5759051

This is a philosophical document. We can soup it up at a later stage,
but for now it's nice to have a URL to point to that isn't a mailing
list post.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5676061

R=golang-dev
CC=golang-dev
https://golang.org/cl/5752059

R=rsc, bradfitz
CC=golang-dev
https://golang.org/cl/5756045

Fixes #3216.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5755056

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5752058

R=golang-dev
CC=golang-dev
https://golang.org/cl/5756044

Either documentation or implementation
of go run's flags is wrong currently.
This change assumes the documentation
to be right.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5752054

Fixes #3201.

R=bradfitz, bradfitz, rsc
CC=golang-dev, remy
https://golang.org/cl/5753045

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5753048

This CL permits using arbitrary, non-VCS-qualified URLs as
aliases for fully VCS-qualified and/or well-known code hosting
sites.

Example 1) A VCS-qualified URL can now be shorter.

Before:
$ go get camlistore.org/r/p/camlistore.git/pkg/blobref
After:
$ go get camlistore.org/pkg/blobref

Example 2) A custom domain can be used as the import,
referencing a well-known code hosting site.

Before:
$ go get github.com/bradfitz/sonden
After:
$ go get bradfitz.com/pkg/sonden

The mechanism used is a <meta> tag in the HTML document
retrieved from fetching:

    https://<import>?go-get=1  (preferred)
    http://<import>?go-get=1   (fallback)

The meta tag should look like:

<meta name="go-import" content="import-alias-prefix vcs full-repo-root">

The full-repo-root must be a full URL root to a repository containing
a scheme and *not* containing a ".vcs" qualifier.

The vcs is one of "git", "hg", "svn", etc.

The import-alias-prefix must be a prefix or exact match of the
package being fetched with "go get".

If there are multiple meta tags, only the one with a prefix
matching the import path is used. It is an error if multiple
go-import values match the import prefix.

If the import-alias-prefix is not an exact match for the import,
another HTTP fetch is performed, at the declared root (which does
*not* need to be the domain's root).

For example, assuming that "camlistore.org/pkg/blobref" declares
in its HTML head:

<meta name="go-import" content="camlistore.org git https://camlistore.org/r/p/camlistore" />

... then:

$ go get camlistore.org/pkg/blobref

... looks at the following URLs:

   https://camlistore.org/pkg/blobref?go-get=1
   http://camlistore.org/pkg/blobref?go-get=1
   https://camlistore.org/?go-get=1
   http://camlistore.org/?go-get=1

Ultimately it finds, at the root (camlistore.org/), the same go-import:

<meta name="go-import" content="camlistore.org git https://camlistore.org/r/p/camlistore" />

... and proceeds to trust it, checking out git //camlistore.org/r/p/camlistore at
the import path of "camlistore.org" on disk.

Fixes #3099

R=r, rsc, gary.burd, eikeon, untheoretic, n13m3y3r, rsc
CC=golang-dev
https://golang.org/cl/5660051

When looking for suitable tag always start
from current version, not the tip.

R=minux.ma, rsc
CC=golang-dev
https://golang.org/cl/5731059

R=r, r
CC=golang-dev
https://golang.org/cl/5759045

go/build: add Context.Compiler

Fixes #3157.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5756047

Not used yet for simpler merge.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5756048

Bit of a band-aid fix.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5757045

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5759044

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5754048

R=golang-dev, bradfitz, r, rsc
CC=golang-dev
https://golang.org/cl/5758044

This exercises the Import function but more importantly
gives us a place to write down the policy for dependencies
within the Go tree.  It also forces us to look at the dependencies,
which may lead to adjustments.

Surprises:
 - go/doc imports text/template, for HTMLEscape (could fix)
 - it is impossible to use math/big without fmt (unfixable)
 - it is impossible to use crypto/rand without math/big (unfixable)

R=golang-dev, bradfitz, gri, r
CC=golang-dev
https://golang.org/cl/5732062

In the test, verify the copied constants are correct.
Also put the test into package utf16 rather than utf16_test;
the old location was probably due creating the test from
utf8, but the separation is not needed here.

R=golang-dev, bradfitz, rsc, rsc, r
CC=golang-dev
https://golang.org/cl/5752047

These appear to have been left out of the CL I submitted earlier.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5759043

Also, tweak run.go to use no more than 2x the
number of CPUs, and only one on ARM.

53.85u 13.33s 53.69r 	 ./run
50.68u 12.13s 18.85r 	 go run run.go

Fixes #2833.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5754047

R=iant, r, gri
CC=golang-dev
https://golang.org/cl/5720073

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/5752048

R=golang-dev, bradfitz, r
CC=golang-dev
https://golang.org/cl/5753047

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5755045

* Splits into three server tests.
  - TestStreamConnServer for tcp, tcp4, tcp6 and unix networks
  - TestSeqpacketConnServer for unixpacket networks
  - TestDatagramPacketConnServer for udp, udp4, udp6 and unixgram networks
* Adds both PacketConn and Conn test clients to datagram packet conn tests.
* Fixes wildcard listen test cases on dual IP stack platform.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5701066

As runtime.UintType is no longer defined, the gccgo error
messages have changed.

bug388.go:12:10: error: reference to undefined identifier ‘runtime.UintType’
bug388.go:12:10: error: invalid named/anonymous mix
bug388.go:13:21: error: reference to undefined identifier ‘runtime.UintType’
bug388.go:17:10: error: reference to undefined identifier ‘runtime.UintType’
bug388.go:18:18: error: reference to undefined identifier ‘runtime.UintType’
bug388.go:22:9: error: non-name on left side of ‘:=’
bug388.go:27:10: error: expected type
bug388.go:32:9: error: expected type
bug388.go:23:14: error: reference to field ‘i’ in object which has no fields or methods

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5755044

The dependency was there only to pull in two constants.
Now we define them locally and verify equality in the test.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5754046

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5757043

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/5756043

go.xclangspec is identical to the one in misc/xcode/3/, except for the heading.

Partial workaround for issue 2401.

R=gri
CC=golang-dev
https://golang.org/cl/5732051

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5754044

R=bradfitz
CC=golang-dev
https://golang.org/cl/5754043

R=golang-dev, bsiegert, jdpoirier
CC=golang-dev
https://golang.org/cl/5727059

Fixes #3182.

R=golang-dev, dvyukov, rsc
CC=golang-dev, remy
https://golang.org/cl/5732057

Once dnsMsg stops using reflect, we lose even more
indirect dependencies.

R=rsc
CC=golang-dev
https://golang.org/cl/5751043

GOROOT_FINAL is a build parameter that means "eventually
the Go tree will be installed here".  Make the file name information
match that eventual location.

Fixes #3180.

R=ken, ken
CC=golang-dev
https://golang.org/cl/5742043