misc/dashboard/codereview: send mail to assigned reviewers if they aren't already looped in.

R=golang-dev, bradfitz, r
CC=golang-dev
http://codereview.appspot.com/6128054
misc/dashboard/codereview: add handy logout URL.

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/6135052
misc/dashboard/codereview: record Message-ID of code review thread mails.

This will allow us to properly thread "R=..." mails at a later time.

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/6135053
runtime: give proper messages when user defined DYLD_INSERT_LIBRARIES on Darwin
       also gives clear error when bsdthread_register fails on Darwin
       Fixes issue 2992.

R=rsc, krautz
CC=golang-dev
http://codereview.appspot.com/5966067

Committer: Russ Cox <rsc@golang.org>
cmd/go: do not ignore DepsErrors in 'go run'

Fixes issue 3490.

R=golang-dev, dave, rsc
CC=golang-dev
http://codereview.appspot.com/6040046

Committer: Russ Cox <rsc@golang.org>
compress/flate: optimize history-copy decoding.

The forwardCopy function could be re-written in asm, and the copyHuff
method could probably be rolled into huffmanBlock and copyHist, but
I'm leaving those changes for future CLs.

compress/flate benchmarks:
benchmark                                 old ns/op    new ns/op    delta
BenchmarkDecoderBestSpeed1K                  385327       435140  +12.93%
BenchmarkDecoderBestSpeed10K                1245190      1062112  -14.70%
BenchmarkDecoderBestSpeed100K               8512365      5833680  -31.47%
BenchmarkDecoderDefaultCompression1K         382225       421301  +10.22%
BenchmarkDecoderDefaultCompression10K        867950       613890  -29.27%
BenchmarkDecoderDefaultCompression100K      5658240      2466726  -56.40%
BenchmarkDecoderBestCompression1K            383760       421634   +9.87%
BenchmarkDecoderBestCompression10K           867743       614671  -29.16%
BenchmarkDecoderBestCompression100K         5660160      2464996  -56.45%

image/png benchmarks:
benchmark                       old ns/op    new ns/op    delta
BenchmarkDecodeGray               2540834      2389624   -5.95%
BenchmarkDecodeNRGBAGradient     10052700      9534565   -5.15%
BenchmarkDecodeNRGBAOpaque        8704710      8163430   -6.22%
BenchmarkDecodePaletted           1458779      1325017   -9.17%
BenchmarkDecodeRGB                7183606      6794668   -5.41%

Wall time for Denis Cheremisov's PNG-decoding program given in
https://groups.google.com/group/golang-nuts/browse_thread/thread/22aa8a05040fdd49
Before: 3.07s
After:  2.32s
Delta:  -24%

Before profile:
Total: 304 samples
         159  52.3%  52.3%      251  82.6% compress/flate.(*decompressor).huffmanBlock
          58  19.1%  71.4%       76  25.0% compress/flate.(*decompressor).huffSym
          32  10.5%  81.9%       32  10.5% hash/adler32.update
          16   5.3%  87.2%       22   7.2% bufio.(*Reader).ReadByte
          16   5.3%  92.4%       37  12.2% compress/flate.(*decompressor).moreBits
           7   2.3%  94.7%        7   2.3% hash/crc32.update
           7   2.3%  97.0%        7   2.3% runtime.memmove
           5   1.6%  98.7%        5   1.6% scanblock
           2   0.7%  99.3%        9   3.0% runtime.copy
           1   0.3%  99.7%        1   0.3% compress/flate.(*huffmanDecoder).init

After profile:
Total: 230 samples
          59  25.7%  25.7%       70  30.4% compress/flate.(*decompressor).huffSym
          45  19.6%  45.2%       45  19.6% hash/adler32.update
          35  15.2%  60.4%       35  15.2% compress/flate.forwardCopy
          20   8.7%  69.1%      151  65.7% compress/flate.(*decompressor).huffmanBlock
          16   7.0%  76.1%       24  10.4% compress/flate.(*decompressor).moreBits
          15   6.5%  82.6%       15   6.5% runtime.memmove
          11   4.8%  87.4%       50  21.7% compress/flate.(*decompressor).copyHist
           7   3.0%  90.4%        7   3.0% hash/crc32.update
           6   2.6%  93.0%        9   3.9% bufio.(*Reader).ReadByte
           4   1.7%  94.8%        4   1.7% runtime.slicearray

R=rsc, rogpeppe, dave
CC=golang-dev, krasin
http://codereview.appspot.com/6127064
misc/dashboard/codereview: send mail immediately, and fill in time.Time fields.

If we delay the mail sending, we can't send as the current user.
If we don't fill in the time.Time fields, datastore.Put will fail
because the zero time.Time value is out of its range.

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/6136053
encoding/json: don't match field name if a JSON struct tag is present.

Fixes issue 3566.

R=rsc
CC=golang-dev
http://codereview.appspot.com/6139048
misc/dashboard/codereview: de-dup LGTMs.

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/6127066