MJPEG Tools Svn

Add the arch/cpu flags used to the summary printed at the end of the configure run

The everything works, now release :)

New (and hopefully much improved ;)) cpu/architecture detection. Will avoid
generating sse/sse2 instructions with gcc3 for systems that can not execute
them. Also can add the "-mcpu=7450" and "-mcpu=970" flags for the G4 and G5
PPC architectures.

o Updated y4mtoppm, y4mcolorbars, and ppmtoy4m to make use of the new
YUV4MPEG2 stuff --- namely, non-4:2:0 chroma subsampling.
o Default output for y4mcolorbars and ppmtoy4m is now 4:4:4.
o Documentation updated.
o png2yuv updated (minimally), too, due to changes in subsample.[ch]
(But, no change to defaults/basic operation.)

Fixed support for VCD2.0 audio-only muxing (audio only is VBR
muxed).
Fixed system header generation for VCD (audio / video headers only
generated if corresponding stream muxed).

Fixed minor screwup with gcc 2.95 case.

Contains workaround for gcc 2.95 bug.

First version of manual page for the new y4mdenoise tool.

First GPL release of y4mdenoise.

This still needs to be reviewed by an actual digital-video expert to
make sure my assumptions are valid.

Now compiles under gcc 3.4
(thanks to Sean Darcy, seandarcy@...)