[Cin] Add in manual

[Phyllis Smith]

Checked into GIT Manual the additional information on problems with
transparencies, with just minor wording/punctuation changes.

Also updated AUTHORS.tex chapter to add additional information on SGE to
add the major Blend Algebra / Blend Program plugins enhancement.  As well
as to note Terje's work on Intel OneVPL/QSV hardware.

On Mon, Feb 17, 2025 at 3:05 AM Andrea paz via Cin <
cin at lists.cinelerra-gg.org> wrote:

> I attach an addition for the manual (Overlay chapter) regarding
> problems due to handling transparencies. I am attaching both Latex and
> txt versions if you would like to make corrections/improvements; but
> even before that is to decide whether to use this text or not.
>
>
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