single event channel.

A quit event is now represented by closing that channel.

R=r, rsc, nigeltao
CC=golang-dev
https://golang.org/cl/2114042

R=r, rsc
CC=golang-dev
https://golang.org/cl/2144043

Also add exporter.Drain() to wait for completion.
This makes it possible for an Exporter to fire off a message
and wait (by calling Drain) for the message to be received,
even if a client has yet to call to retrieve it.

Once this design is settled, I'll do the same for import send.

Testing strategies welcome.  I have some working stand-alone
tests.

R=rsc
CC=golang-dev
https://golang.org/cl/2137041

R=rsc
CC=golang-dev
https://golang.org/cl/2160041

R=gri
CC=golang-dev
https://golang.org/cl/2116043

The ken directory is untouched so we have some examples with explicit semis.

R=gri
CC=golang-dev
https://golang.org/cl/2157041

Fixes #1075.

R=gri
CC=golang-dev
https://golang.org/cl/2104048

The makefiles for prof and cov use it already.
(It's also in Make.clib.)

R=adg
CC=golang-dev
https://golang.org/cl/2036045

(Following new convention.)

Fixes #1063.

R=adg
CC=golang-dev
https://golang.org/cl/2115042

Solves the (English) peg solitaire game. The board is represented
by a 1-dimensional array for easy representation of directions
with a single integer. The board's contents are chosen such that
it can be printed with a direct string() conversion.

R=r
CC=adg, golang-dev
https://golang.org/cl/2066042

R=rsc
CC=golang-dev
https://golang.org/cl/2121042

image's color model and dimensions without allocating and decoding its
actual pixels.

Fixes #695.

R=r
CC=golang-dev
https://golang.org/cl/2151042

R=rsc, r
CC=golang-dev
https://golang.org/cl/2112042

R=gri
CC=golang-dev
https://golang.org/cl/2147042

R=ken2
CC=golang-dev
https://golang.org/cl/2141042

Fixes #1069.

R=rsc
CC=golang-dev
https://golang.org/cl/2143041

R=r
CC=golang-dev
https://golang.org/cl/2052041

R=r
CC=golang-dev
https://golang.org/cl/2051041

R=dsymonds, r
CC=golang-dev
https://golang.org/cl/2050043

Changes to FuncLine sync it with symtab.c's funcline.

R=r
CC=girard.m1, golang-dev
https://golang.org/cl/2083041

Fixes #1071.

R=ken2
CC=golang-dev
https://golang.org/cl/2136043

Fixes #897.

goinstall -a can be used to reinstall all packages after an upgrade
goinstall -a -u can be used to update all package
A history of remote package installs is stored in $GOROOT/goinstall.log

R=rsc, adg
CC=golang-dev
https://golang.org/cl/1947041

R=rsc
CC=golang-dev, r
https://golang.org/cl/2141041

Fixes #1064.

R=rsc, lvd, vcc
CC=golang-dev
https://golang.org/cl/2104042

bug284.go:33: error: invalid type conversion
bug284.go:36: error: invalid type conversion (cannot use type A2 as type A1)
bug284.go:37: error: invalid type conversion
bug284.go:38: error: invalid type conversion (cannot use type A1 as type A2)
bug284.go:56: error: invalid type conversion
bug284.go:59: error: invalid type conversion (cannot use type S2 as type S1)
bug284.go:60: error: invalid type conversion
bug284.go:61: error: invalid type conversion (cannot use type S1 as type S2)
bug284.go:71: error: invalid type conversion
bug284.go:74: error: invalid type conversion (cannot use type P2 as type P1)
bug284.go:75: error: invalid type conversion
bug284.go:76: error: invalid type conversion (cannot use type P1 as type P2)
bug284.go:96: error: invalid type conversion
bug284.go:99: error: invalid type conversion (cannot use type Q2 as type Q1)
bug284.go:101: error: invalid type conversion (cannot use type Q1 as type Q2)
bug284.go:111: error: invalid type conversion (different parameter types)
bug284.go:114: error: invalid type conversion (different parameter types)
bug284.go:115: error: invalid type conversion (different parameter types)
bug284.go:116: error: invalid type conversion (different parameter types)
bug284.go:134: error: invalid type conversion (incompatible type for method 'f' (different result types))
bug284.go:137: error: invalid type conversion (incompatible type for method 'f' (different result types))
bug284.go:138: error: invalid type conversion (incompatible type for method 'f' (different result types))
bug284.go:139: error: invalid type conversion (incompatible type for method 'f' (different result types))
bug284.go:149: error: invalid type conversion
bug284.go:152: error: invalid type conversion (cannot use type L2 as type L1)
bug284.go:153: error: invalid type conversion
bug284.go:154: error: invalid type conversion (cannot use type L1 as type L2)
bug284.go:164: error: invalid type conversion
bug284.go:167: error: invalid type conversion (cannot use type L2 as type L1)
bug284.go:168: error: invalid type conversion
bug284.go:169: error: invalid type conversion (cannot use type L1 as type L2)
bug284.go:179: error: invalid type conversion
bug284.go:182: error: invalid type conversion (cannot use type C2 as type C1)
bug284.go:183: error: invalid type conversion
bug284.go:184: error: invalid type conversion (cannot use type C1 as type C2)

R=rsc
CC=golang-dev
https://golang.org/cl/2136041

bug278.go:18: error: invalid left hand side of assignment
bug278.go:19: error: array is not addressable
bug278.go:21: error: invalid left hand side of assignment
bug278.go:22: error: invalid left hand side of assignment

R=rsc
CC=golang-dev
https://golang.org/cl/2122042

This is a common task, so it makes sense to have a helper to do it.

(App Engine doesn't like "Transfer-Encoding: chunked" for POST
bodies, which is the default for regular Post.)

R=rsc
CC=golang-dev
https://golang.org/cl/2113041

R=golang-dev, gri1, gri
CC=golang-dev
https://golang.org/cl/2083042

It's unlikely to affect any extant code, but I wanted to make this API change
before digging in for a rewrite.

R=rsc
CC=golang-dev
https://golang.org/cl/2112041

The gccgo compiler is smart enough to not make something which
is not used.  Use global variables to defeat this
optimization.

R=rsc
CC=golang-dev
https://golang.org/cl/2129041

R=rsc, r, ken2
CC=golang-dev
https://golang.org/cl/2128041

No semantic change.

R=rsc
CC=golang-dev
https://golang.org/cl/2121041

What was meant to be a list appeared as a paragraph with dashes.

R=golang-dev, gri1, gri
CC=golang-dev
https://golang.org/cl/2100041

No semantic change.

R=rsc
CC=golang-dev
https://golang.org/cl/2099041

R=gri, rsc
CC=golang-dev
https://golang.org/cl/2078041

bug255.go:11: error: array bound truncated to integer
bug255.go:12: error: array bound is not numeric
bug255.go:13: error: array bound is not numeric
bug255.go:14: error: array bound is not constant
bug255.go:15: error: array bound overflows

R=rsc
CC=golang-dev
https://golang.org/cl/2091042

Another case where gccgo and gc report similar but not
identical errors for a recursive interface.

bug251.go:11: error: invalid recursive interface

R=rsc
CC=golang-dev
https://golang.org/cl/2094041

R=rsc
CC=golang-dev
https://golang.org/cl/2095041

R=rsc
CC=golang-dev
https://golang.org/cl/2029042

This introduces GC_ERROR to mark an error only issued by the
gc compiler.  GCCGO_ERROR already exists to mark errors only
issued by the gccgo compiler.  Obviously these should be used
sparingly.

bug195.go:9: error: interface contains embedded non-interface
bug195.go:12: error: interface contains embedded non-interface
bug195.go:15: error: interface contains embedded non-interface
bug195.go:18: error: invalid recursive interface
bug195.go:22: error: invalid recursive interface

R=rsc
CC=golang-dev
https://golang.org/cl/2040043