updated sketch

Hello!

    I have published on the project page an updated sketch.  Now it has intra
prediction support, but most part of it remains to be completed.

    A nice and mostly easy to achieve initial milestone is to finish intra prediction,
transform and quantization.  With this a test program that reads a YUV sequence,
intra predicts, encodes, decodes and writes back the resulting YUV sequence could
be implemented.  The quantization parameter should be specified on the command
line among the file paths.

    This milestone gives immediate visual and practical results, so as Christoph said,
people can have fun... ;-)

    Give it a try.

    /AITOR