FEATURE REQUEST - Add Opposite Tack (Gybe) Angle

[RhumbRunner]

I've modified my trueWind Calculation file to compute the heading with the same apparent wind angle on the opposite Tack or Gybe as I am currently on in both True and Magnetic. Here is the code for someone to see if it's worthy of being added to the next release.

Thanks
trueWind.js.txt