MJPEG Tools Svn

Tidy up a little during the Release Candidate phase. The chroma-type member
is not just for MJPG (could be 'yuv') so shorten the name from 'MJPG_chroma'
to simply 'chroma'.

Need to use "head -n 1" instead of the deprecated "head -1" form - some
systems moan&groan about the traditional form.

assumptions about chroma subsampling should not be coded in as explicit
"divide by 4" (which assumes 4:2:0). Use the Y4M API to dynamically compute
the chroma plane size. I.E. do not do 'w * h / 4' but instead use
y4m_chroma_ss_x_ratio (and 'y').

Fix RPM build

accidentally left out an arg in the usage summary for the chroma option. -x
takes an argument

Overlooked the 'k' (flip bytes) option in the getopt() call.

A nev version for the comming release

Oops - single quotes instead of double quotes in a few places (PPC).

Fix gcc4 support for PPC arch

Changes from Burkhard Plaum (libquicktime) for gcc4 support.