MJPEG Tools Svn

What started out as adding interlace detection (check the 'fiel' atom) for
quicktime files turned into a general cleanup effort. No need to have
duplicate definitions for interlacing (#define LAV_INTER_TOP_FIRST Y4M_ILACE_TOP_FIRST, ...)
so replace the copies (LAV_*) with their Y4M_* equivalents.

Get the sample aspect from the 'pasp' atom in Quicktime files. This requires
a newer version of libquicktime so the required version of libquicktime was
bumped to 0.9.7

Consolidate the dataformat checking in 1 place. Previously there were two
places which made _different_ checks for the data format. The YUV cases are
still wrong or missing support code but at least now the check is only made
in one place.

Eventually a decision should be made to either implement support for the
various "YUV" formats or remove the incomplete (incorrect) portions that are
present.

Oops - forgot to include a few files in the distribution kit: README, ChangeLog,
TODO, INSTALL

some bugfixes (greenlines top and below), more preparation to support more
chroma-modes... Currently outputs 420 at half field-rate

writeframe() [writepic.cc] was an empty file - the entire function body was
ifdef'd out _and_ the 1 reference to writeframe() was ifdef'd out with
a DEBUG block (which would have done nothing even if DEBUG was defined).
Remove writepic.cc (which hasn't been touched in almost 2 years).

Use the bufalloc() routine from libmjpegutils (utils/cpu_accel.c). Not only
does this prevent needless code duplication but the pointer from mjpegutil's
bufalloc() can be passed to free() (the one returned by duplicate code could
not be passed to free()).

Not referenced, not built, not installed - doesn't appear to have been used
since December 2004 so remove it.

Oops - forgot to update glib and gtk to glib2 and gtk2.

Some tidying up but mostly clarifying comments/documenation.