[Cin] Blend Algebra /Program in manual

[Phyllis Smith]

Since I will be making new AppImages tomorrow, I wanted to make sure the
HTML and PDF manuals contained the information on the SGE 2 new plugins.
Not only was the work SGE did on the code huge, so was the documentation.
Luckily Andrea was willing to put it in Latex format.  I changed some
wording and punctuation, but ran out of time in total review so checked in
what I had -- I hope it does not appear to be massacred.  The important
note in the first paragraph of the Blend plugins is to refer to the
original document as store on the website:

https://cinelerra-gg.org/download/testing/BlendPluginExamples/README.blendalg
Although this file is also as written in the "doc" directory, users with
AppImage do not have easy access there so that is why it was put on the
website also.

On Tue, Feb 18, 2025 at 9:41 AM Andrea paz via Cin <
cin at lists.cinelerra-gg.org> wrote:

> I append the file to Blend Algebra and Blend Program in both Latex and
> txt versions for any revisions. I kept the treatment of the two
> plugins together because doing them separately would have doubled the
> number of pages with the only difference being a few sentences.
>
>
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