Updated color space definitions.
Instead of haphazardly quoting some standards documents which are completely
inadequate at defining a transformation from Y'CbCr space to a device-independent
space, a new document, doc/color.html, has been included which explicitly spells
out all the necessary parameters for each space.
For now, the number of spaces has been kept at 2: One for NTSC systems and
one for PAL/SECAM systems.
This breaks API compatibility, because the old color space constants were
replaced.
As far as name space pollution goes, they were really horrible constants anyway.
git-svn-id: http://svn.xiph.org/trunk@5372 0101bb08-14d6-0310-b084-bc0e0c8e3800