[Cin] Some tests on blending

[Andrea paz]

In reference to the email:
 https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg04905.html
and to the whole of the following discussion, which includes a
workaround by IgorBeg. I have tried further testing, now that we have
Blend Algebra that allows us to customize the various Blends.
I do not know whether it is appropriate to reopen an issue that is now
closed and has also led to tensions (you can see the article:
https://linuxvideoediting.blogspot.com/2022/09/transparent-text-effect-with-Cinelerra-part2.html.
I warn that it contains polemics). So I will only report the result of
some of my tests; they are probably not even worth reading.
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