This fixes the most annoying bug in the go command,
that 'go build' sometimes ignored packages it had just
rebuilt in favor of stale installed ones.

This part of the code needs more thought, but this small
change is an important improvement.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5531053

R=golang-dev, akumar, rsc
CC=golang-dev
https://golang.org/cl/5534055

This should make conversion from Unix mode
to os.FileMode and back not lossy.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5531052

I didn't believe that OpenPGP allowed > SHA-1 with DSA, but it does and
so we need to perform hash truncation.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5510044

The recover code assumes that the panic() argument was
an error, but it is usually a simple string.
Fixes #2663.

R=golang-dev, r, r, gri
CC=golang-dev, remy
https://golang.org/cl/5527046

Fixes #2662.

R=golang-dev, rogpeppe, r, r
CC=golang-dev, r, rogpeppe
https://golang.org/cl/5515050

Fixes #2576.

R=rsc
CC=golang-dev
https://golang.org/cl/5498105

R=rsc, borman
CC=golang-dev
https://golang.org/cl/5525043

- use slice ops for convertWords instead of lo/hi boundaries
- always compute leading zeroes (simplifies logic significantly),
  but remove them once, at the end (since leafSize is small, the
  worst-case scenario is not adding significant overhead)
- various comment cleanups (specifically, replaced direct -> iterative,
  and indirect -> recursive)
- slightly faster overall for -bench=String

(This CL incorporates the changes re: my comments to CL 5418047
https://golang.org/cl/5418047/ )

benchmark                          old ns/op    new ns/op    delta
big.BenchmarkString10Base2               519          527   +1.54%
big.BenchmarkString100Base2             2279         2158   -5.31%
big.BenchmarkString1000Base2           18475        17323   -6.24%
big.BenchmarkString10000Base2         178248       166219   -6.75%
big.BenchmarkString100000Base2       1548494      1431587   -7.55%
big.BenchmarkString10Base8               415          422   +1.69%
big.BenchmarkString100Base8             1025          978   -4.59%
big.BenchmarkString1000Base8            6822         6428   -5.78%
big.BenchmarkString10000Base8          64598        61065   -5.47%
big.BenchmarkString100000Base8        593788       549150   -7.52%
big.BenchmarkString10Base10              654          645   -1.38%
big.BenchmarkString100Base10            1863         1835   -1.50%
big.BenchmarkString1000Base10          12099        11981   -0.98%
big.BenchmarkString10000Base10         57601        56888   -1.24%
big.BenchmarkString100000Base10     20123120     19827890   -1.47%
big.BenchmarkString10Base16              358          362   +1.12%
big.BenchmarkString100Base16             815          776   -4.79%
big.BenchmarkString1000Base16           4710         4421   -6.14%
big.BenchmarkString10000Base16         43938        40968   -6.76%
big.BenchmarkString100000Base16       406307       373930   -7.97%

R=michael.jones, mtj
CC=golang-dev
https://golang.org/cl/5432090

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5531048

Instead of syntax-tables, an extended go-mode-cs is used for
from a font-lock callback.

Cache invalidation must happen in a before-change-function
because font-lock runs in an after-change-function, potentially
before the cache invalidation takes place.

Performance is reasonable, even with src/pkg/html/entity.go
and test/fixedbugs/bug257.go.

Fixes #2330.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5529045

breaks 386 build

««« original CL description
gc: put limit on size of exported recursive interface

Prevents edge-case recursive types from consuming excessive memory.

Fixes #1909.

R=golang-dev, lvd, rsc
CC=golang-dev
https://golang.org/cl/5504108

»»»

R=lvd, lvd
CC=golang-dev
https://golang.org/cl/5534049

Prevents edge-case recursive types from consuming excessive memory.

Fixes #1909.

R=golang-dev, lvd, rsc
CC=golang-dev
https://golang.org/cl/5504108

As discussed in this thread:

https://groups.google.com/group/golang-dev/browse_thread/thread/5b76b7700265a787

I've tried to come up with a solution that is minimally invasive for the platforms that don't support "parent death signal", without splitting up exec_unix.go.

See also: http://www.win.tue.nl/~aeb/linux/lk/lk-5.html#ss5.8

R=rsc, dave, borman, iant, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/5487061

R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/5530048

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/5519050

R=r, dsymonds
CC=golang-dev
https://golang.org/cl/5530047

R=golang-dev
CC=golang-dev
https://golang.org/cl/5531046

R=hectorchu, alex.brainman
CC=golang-dev
https://golang.org/cl/5519054

        Also add basic tests.

R=golang-dev
CC=golang-dev
https://golang.org/cl/5533045

R=golang-dev, gri, bradfitz, iant
CC=golang-dev, rsc
https://golang.org/cl/5523049

Fixes #2627.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5498088

R=gri
CC=golang-dev
https://golang.org/cl/5515052

R=iant, gri
CC=golang-dev
https://golang.org/cl/5517056

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5521052

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5516049

R=gri
CC=golang-dev
https://golang.org/cl/5519048

Command arguments are separated from input .go file arguments
by a -- separator.

R=rsc, golang-dev, adg
CC=golang-dev
https://golang.org/cl/5514046

Originally published on the Go blog on 5 Jan 2011:
http://blog.golang.org/2011/01/go-slices-usage-and-internals.html

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5516046

Fixes #2655.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5510045

gofmt likes to put lines like
  // STOP OMIT
two blank lines from a closing brace, creating an ugly space inside
<pre> blocks in some of these files. This change resolves this issue.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5520044

If there's a error compiling a _test.go file, the error
message tries to print a *Package with %s. There's no String
method on *Package, so the error message looks bad.
Since the error messages identify the file in question
anyway, this CL removes the package from the error message.

R=rsc, gri
CC=golang-dev
https://golang.org/cl/5520045

Logb errors were reported as Ilogb errors.

R=rsc, golang-dev, gri
CC=golang-dev
https://golang.org/cl/5517045

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5523044

Fix incorrect marshal/unmarshal of certificateRequest.
Add support for configuring client-auth on the server side.
Fix the certificate selection in the client side.
Update generate_cert.go to new time package

Fixes #2521.

R=krautz, agl, bradfitz
CC=golang-dev, mikkel
https://golang.org/cl/5448093

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5517044

Fixes #2637.

R=golang-dev, mikioh.mikioh, iant
CC=golang-dev
https://golang.org/cl/5508043

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5522043

Also, add XTestGoFiles to the go command's public api.

Fixes #2649.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5502102

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5511047