[Cin] Blend Algebra /Program in manual

[Andrea paz]

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.
However, if you prefer two entries it is easy to make the change.
The text should be put (copy and paste) between the plugins “Auto
Scale” and “Blue Banana”

@Georgy
I have taken a lot out of your detailed explanations, if you feel that
this is unclear or otherwise improvable, please let me know. For
example, I took out the parts for “programmers,” which would actually
be the most important part of these plugins. I put the link to
MantisBT for your full explanations, but I don't like to link back to
the bug tracker, so if you make a guide for the source or whatever, I
will change the link to the latter. If you think it would be better to
put your full explanation instead of a summary, I have no problem with
that.
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