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Prevents mc from using uninitialized source pixels.

Should give much better quality, but still doesn't support MB-tree yet.
Also check for the same interlaced options between passes.
Various minor ratecontrol cosmetics.

pixel_ads1_avx, predict_8x8_hd_avxx
High bit depth mc_copy_w8_sse2, denoise_dct_avx, prefetch_fenc/ref, and several pixel*sse4.

Unused frame_sort.
Unused x86_64 dequant_4x4dc_mmx2, predict_8x8_vr_mmx2.
Unused and broken high_depth integral_init*h_sse4, optimize_chroma_*, dequant_flat_*, sub8x8_dct_dc_*, zigzag_sub_*.
Useless high_depth dequant_sse4, dequant_dc_sse4.

These changes were split out of the cpuflags commit because they change the output executable.

Reduces the number of macro args that need to be passed around.
Allows multiple implementations of a given macro (e.g. PALIGNR) to check
cpuflags at the location where the macro is defined, instead of having
to select implementations by %define at toplevel.
Remove INIT_AVX, as it's replaced by "INIT_XMM avx".

This commit does not change the stripped executable.

Caused slightly worse compression.

Previously required "--asm sse2fast,fastshuffle,sse4.2,avx".

Replace av_find_stream_info with avformat_find_stream_info.
Now requires libavformat 53.3.0 or newer.

This makes them available to external programs as part of the public API.

Fix crash when failed to parse timecode file before malloc pts.
Fix detection of user timebase considered to be exceeding H.264 maximum.

Use FDEC_STRIDEB where appropriate.

Caused crashes in rare cases with lossless encoding.  Regression in 4:4:4.

Use the same thresholding as for p16x8/8x16.
Does p8x4/4x8 search more often, for a small compression improvement.

Necessary for a future trellis mode decision/motion estimation patch.
Also add the slowest presets to the regression test.

The output-changing portion of the next patch.

This allows use of the full range of chroma QP offsets, even in combination with the automatic psy-based adjustments.

The cpu_set_t structure is considered opaque.
Also handle sched_getaffinity() error case if "cpusetsize is smaller than the size of the affinity mask used by the kernel."

Replace avcodec_open with avcodec_open2. Now requires libavcodec 53.6.0 or newer.