[Cin] New feature: enhanced Motion plugin

[Andrea paz]

Great job! It is really a valuable contribution, on a plugin that is
little used because of its complexity.
I have integrated your additions on the latex manual. Now Phyllis will
do a review and put it on git.
I saw that you brought "Add offset" on Motion plugin, so you could
delete Motion-CV. I think Motion-HV has some recent optimizations
(2017). Do you think you can delete Motion-HV too or is it better to
leave it? What about Motion 2 Points?
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