[Cin] Update on Blend Algebra / Blend Program plugins

[Phyllis Smith]

*SGE* "no user impact" patch applied in GIT source checkin for increased
robustness which you can see if you want at:
    https://www.cinelerra-gg.org/bugtracker/view.php?id=670
For those who take advantage of *Andrey*'s package releases for automatic
updates, they are building and are at:
   https://github.com/einhander/cin-gg-packages/releases

Also, checked into GIT Manual a few minor changes to the wording,
punctuation, and removing commentary that I found interesting but  would
not help the user in usage (for example, "there is proof that any program
has infinite number of undetected bugs"!!). Modified the Developer's
section to put these plugins' workflow here so that developers can follow
this methodology to in the future to add additional effects, because as was
stated "one can more quickly test different combinations without spending
time to restart Cinelerra, recompile it, reload project, and reattach
plugins, etc.".  Section is "*Unique Blend plugins workflow*".  After I do
some more checking, I will at least update the PDF document on the website.

*Andrea *had provided some latex fixes for other plugin figures that were
out of whack that I checked in too.  And if he has time, could he check
that I got them right?  I spotted another figure that needed fixing but I
can not remember where it was.

*IgorBeg* - curiosity question -- does the white line on the bottom of the
Blend Algebra icon represent the fact that it combines its tracks? or does
it represent the fact that there are multiple tracks? or something else?
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