Clothoid unit corrections

Regarding the UML model for class "Clothoid":

• The attribute "curvature" for class Clothoid has no unit defined. Must be [1/m]. Range ]-inf...inf[.
• The attribute "curvatureDot" for class Clothoid has unit [1/s]. Must be [1/m²], since curvature is derived with respect to arc length and not time. Therefore it should also not be named "curvatureDot" because this implies derivation with respect to time, but "curvaturePrime" (curvature´). The range could also be negative, so the curvature can be 0 at a certain arc length and then bend to the opposite direction. Range: ]-inf...inf[.
• The attribute "length" has no unit defined. Should be [m]. Range ]0...inf[

Additional description for the class "Clothoid": If curvaturePrime is 0, then the resulting trajectory is a circular arc. If curvaturePrime is 0 and additionally curvature is 0, then the resulting trajectory is a line.