made speed and bearing members private - had accidentally forget the visibility specifier.
Mock.Polars:
Added linear interpolation between speed values (e.g., if the wind speed is 15.9kn, it will interpolate between the 12kn and 16kn data). This allows for wind speeds less than 4kn (the lowest wind speed in the data file). It does not extrapolate anything for wind speeds larger than 30kn (the largest wind speed in the data file).
Also refactored some of the code into some interpolation functions.
#story[873]