Merge pull request #3 from MOARdV/master

Fixes for orbit drawing routine (DrawTrail) ...
Target menu is almost usable now.
Defined plans for 0.10 release.
Sorting!
And now to actually find the available docking ports...
I'm not yet settled on port naming...

...but it sort of works.
That should also be nice...
Always have a plan B.
That was a bad idea.
Let's switch to enums for readability first...
Ok, now we can grey stuff out...
Upon reflection...
Now to meditate on filtering.
Oh right.
That was actually too aggressive.
Formatting.
Idea.
Ok, before I implement vessels filtering...
Ok, I think filters work...
...and filters persist.