[Cin] New release update

[Phyllis Smith]

October 2022 end of month new release AppImages now available.  This
includes a fix for a minor ffmpeg 5.1 security flaw that Andrew discovered
and made us a patch for.  Full release notes at:
https://cinelerra-gg.org/download/releasenotes.pdf .

************ October Release Notes update ******************
*Security flaw in FFmpeg 5.1* was discovered and Andrew forwarded the patch
for us to use.
A *Direct Copy speed-up* has been added for EXR and PPM sequences that
Andrew found.
Tiny corrections and addition to Cinelerra_factory presets and plugin.opts.
Newer versions of Ubuntu require an additional package install for
*bld_prepare.sh
as Goat found*.
The Manual has had another section added, *Alternative Views of Overlay
Modes*, which presents a more “real world” usage display of the overlay
modes using a color/black & white gradient + video.
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