David Vincent authored Nov 18, 2016 and David Vincent committed Dec 16, 2016

coordinates[0] are coordinates of point 0
coordinates[:,0] is an arry of longitudes of all points
creat slimPre.rotate3D which allow for rotating a vector from lon/lat coordinate system to the mesh coordinate system on a manifold

 fix function rotate in class Coordinate_system:
    the angle is now correctly compute and the transformation matrix is modified accordingly (the old function used an angle improperly computed)