Originally committed as revision 2639 to svn://svn.ffmpeg.org/ffmpeg/trunk

interlaced mpeg2 encoding
  P & B frames
  rate distored interlaced mb decission
  alternate scantable support
4mv encoding fixes (thats also why the regression tests change)
passing height to most dsp functions
interlaced mpeg4 encoding (no direct mode MBs yet)
various related cleanups
disabled old motion estimaton algorithms (log, full, ...) they will either be fixed or removed

Originally committed as revision 2638 to svn://svn.ffmpeg.org/ffmpeg/trunk

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IMA decoding

Originally committed as revision 2618 to svn://svn.ffmpeg.org/ffmpeg/trunk

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Originally committed as revision 2605 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec to compile without CONFIG_ENCODERS defined
patch by (Aurelien Jacobs <aurel at gnuage dot org>)

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cleanups & fixes by me

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Originally committed as revision 2569 to svn://svn.ffmpeg.org/ffmpeg/trunk

slice cleanup

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