When data is received for a channel, but that channel
is not ready to receive it, the central run() loop
is currently blocked, but this can lead to deadlock
and interference between independent channels.
This CL adds an explicit buffer size to netchan
channels (an API change) - the sender will not
send values until the buffer is non empty.

The protocol changes to send ids rather than channel names
because acks can still be sent after a channel is hung up,
we we need an identifier that can be ignored.

R=r, rsc
CC=golang-dev
https://golang.org/cl/2447042

Facilities for printing stack traces from within a running goroutine.

R=rsc
CC=golang-dev
https://golang.org/cl/4031041

TBR=adg
CC=golang-dev
https://golang.org/cl/3992044

R=rsc, adg
CC=golang-dev
https://golang.org/cl/4002041

R=adg, rsc
CC=golang-dev
https://golang.org/cl/3851041

R=r, gri
CC=golang-dev
https://golang.org/cl/4072042

R=rsc, brainman
CC=golang-dev
https://golang.org/cl/4079041

Dll names and function names padded to even size.
Refactoring of imports writing code.

R=rsc
CC=golang-dev
https://golang.org/cl/3804042

R=brainman, rsc
CC=golang-dev
https://golang.org/cl/1731047

R=rsc
CC=golang-dev
https://golang.org/cl/3561041

R=rsc
CC=golang-dev
https://golang.org/cl/3766042

R=rsc
CC=binet, golang-dev
https://golang.org/cl/3906041

Also:
* document special cases for Frexp and Ldexp
* handle ±Inf in Ldexp
* correctly return -0 on underflow in Ldexp
* test special cases for Ldexp
* test boundary cases for Frexp, Ilogb, Ldexp, and Logb

R=rsc
CC=golang-dev
https://golang.org/cl/3676041

R=golang-dev, rsc, rsc1
CC=golang-dev
https://golang.org/cl/2309043

Minor cleanup:
  - removed a duplicate test case
  - added a function to remove repeated code
  - for consistency, replaced "return nil" with a panic at an
    unreachable point

Fixes #1428.

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/4057042

R=benlynn, rsc
CC=golang-dev
https://golang.org/cl/4062042

R=r, r2
CC=golang-dev
https://golang.org/cl/3980042

suggested by Mark Summerfield

R=r
CC=golang-dev
https://golang.org/cl/4018042

Fixes #1421.

R=r, rsc, iant, ken2
CC=golang-dev
https://golang.org/cl/4039042

R=r, r2
CC=golang-dev
https://golang.org/cl/3982045

RFC2616 sections 4.4 and 14.16:
  * Cannot use Content-Length with non-identity Transfer-Encoding
  * Content-Range response is "bytes x-y/z" not "x-y/z"

R=rsc
CC=golang-dev
https://golang.org/cl/4018041

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4081041

For Windows, the options for syscall.Wait4() aren't used.
Then this will be dummy value like WNOHANG, WSTOPPED.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4075041

R=agl, adg
CC=golang-dev
https://golang.org/cl/4073041

R=r
CC=golang-dev
https://golang.org/cl/4008044

R=rsc, r
CC=golang-dev
https://golang.org/cl/3994042

Fixes #1032.

R=ken2
CC=golang-dev
https://golang.org/cl/4025043

Fixes #397.

R=ken2
CC=golang-dev
https://golang.org/cl/3994043

This introduces support for selecting which subelement
to unmarshal into a given struct field by providing a
nesting path separated by the > character.

R=rsc
CC=golang-dev
https://golang.org/cl/4066041

$ 6.out
panic: runtime error: invalid memory address or nil pointer dereference

[signal 11 code=0x1 addr=0x0 pc=0x1c16]

runtime.panic+0xa7 /Users/rsc/g/go/src/pkg/runtime/proc.c:1089
	runtime.panic(0xf6c8, 0x25c010)
runtime.panicstring+0x69 /Users/rsc/g/go/src/pkg/runtime/runtime.c:88
	runtime.panicstring(0x24814, 0x0)
runtime.sigpanic+0x144 /Users/rsc/g/go/src/pkg/runtime/darwin/thread.c:465
	runtime.sigpanic()
main.f+0x16 /Users/rsc/x.go:5
	main.f()
main.main+0x1c /Users/rsc/x.go:9
	main.main()
runtime.mainstart+0xf /Users/rsc/g/go/src/pkg/runtime/amd64/asm.s:77
	runtime.mainstart()
runtime.goexit /Users/rsc/g/go/src/pkg/runtime/proc.c:149
	runtime.goexit()

R=r
CC=golang-dev
https://golang.org/cl/4036042

should have been included in last CL; no idea why it was not

R=brainman
CC=golang-dev
https://golang.org/cl/4005043

Have to set #defines correctly to get correct value.
Otherwise get a mask for use in implementing WIFSTOPPED(status).

Changed WSTOPPED definition in os because on
OS X WSTOPPED and WUNTRACED have different values
even though they seem to mean the same thing.

Fixes #1374.

R=r, r2
CC=golang-dev
https://golang.org/cl/4063042

R=brainman
CC=golang-dev
https://golang.org/cl/4042042

A wrongly nested if prevented the message from appearing.

Fixes #1420.

R=r, r2
CC=golang-dev
https://golang.org/cl/3987043

Fixes #1411.

R=rsc, gri, ejsherry
CC=golang-dev
https://golang.org/cl/4035042

R=r, rsc, dsymonds
CC=golang-dev
https://golang.org/cl/4044041

R=josv, r
CC=golang-dev
https://golang.org/cl/4065041

R=rsc, iant2
CC=golang-dev
https://golang.org/cl/3974044

after call to deferproc

R=r
CC=golang-dev
https://golang.org/cl/4059041

R=r
CC=golang-dev
https://golang.org/cl/4004042