MJPEG Tools Svn

Added the patch from Pieter du Preez
from the 22.Jan.2007 he sent to the mailinglist.

it is a speedup when readding the same file several times:
- it does not change any functionality of jpeg2yuv.
- it does not change jpeg2yuv's command line interface.
- it massively speeds up the generation of stills, when using jpg2yuv
as shown in my first 3 examples. As most users will opt for the
first or second example, this patch will help them.

Obvious error - should be ifndef and then provide a 1st operand to the !=
operator

Remove the --enable-zalpha from the configure.ac file. This should reduce
the temptation for people to enable NON-compilable code which may or may not
still work (even if it did compile ;)).

If someone really wants the 'zalpha' stuff enabled then edit mplex's automake
file (mplex/Makefile.am) and follow the directions given there.

Typo - remove the extra/not-needed } character

Add a 'typedef void quicktime_t' for those systems which choose not to
install libquicktime.

Sigh, some folks don't install libquicktime. SO we can't use quicktime_t*
for the qt_fd type, instead revert back to the void*.

Add code to allow a program to selectively reset SIMD motion functions to the
reference C code. See the comment in utils/motionsearch.c

Cleanup - avilib.h is always installed in <mjpegtools/avilib.h> so there is
no need to replicate the declarations from avilib.h in lav_io.c

Make qt_fd a quicktime_t* instead of void*

SIgh, there is a HUGE difference between

ptr = malloc(N) + M

and

ptr = malloc(N + M)

when "extra/padding" bytes are needed you have to use the second form and
not the first!!!