Merge "16x16 DCT blocks." into experimental

diff --cc configure
Simple merge

diff --cc vp8/common/blockd.h
Simple merge

diff --cc vp8/common/generic/systemdependent.c
Simple merge

diff --cc vp8/decoder/decodframe.c
Simple merge

diff --cc vp8/encoder/bitstream.c
Simple merge

diff --cc vp8/encoder/onyx_if.c
Simple merge

diff --cc vp8/encoder/onyx_int.h
Simple merge