Changed the way relative angles are calculated for docking.

Hopefully fixed the relative angle calculations to make them useful for docking.  They should now match the angles shown by NavyFish's plugin.  


I'm still learning github....  so this pull request may be trying to commit my old changes again as well as the new ones... because I haven't figured out how to update my fork from the master after you accepted the last pull request.  

So... before you hit whichever button makes the magic happen, make sure I'm not sending you bad magic.  :)  If I need to do something differently, let me know.