simplifications. this commit is ignoring failing tests. the sortedPoly-algorithm has to be fixed for generic cases

This reverts commit 202d5900.

This reverts commit 0e1426c1.

fix consistent use of angles in extract_geo_paras. using y-axis as reference for camber_angle as it is intended by the according test-function

fix beta_notation (old ntr notation). should we switch? in any case, make this documented via the profile-plot!