Interpolation is not needed (and was not working) in order to find the
alpha zero of all elements when the polar is provided for a single
reynolds angle.

Make sure we can properly initiate the objects when using coaxial rotors as
well.

Remove some useless files for the archive release. This allows user to
download a more straight-to-the-point code, without all bells and
whistles for gitlab, pipelines, etc.

This is the initial commit of Rotare's code.
THE CODE IS NOT YET VALIDATED AT THIS POINT. Please proceed carefully.