Ground track improvements#194

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srcejon wants to merge 3 commits intocsete:masterfrom

srcejon:ground_track_updates

Commits on Feb 18, 2020

Add arrows to ground track to show direction satellite is moving in
srcejon
committed

Commits on Feb 20, 2020

Add option to automatically display ground track for selected satellite.
srcejon
committed

Commits on Feb 23, 2020

Add support for fractional number of orbits < 2. When number of orbits < 2, start ground track 25% of orbit behind current satellite position
srcejon
committed