Rotator controller: improve tracking with flips(go smooth near zenith).#140

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bychek wants to merge 2 commits intocsete:masterfrom sputnixru:rotctl-improve-tracking-with-flips

+125-14

Commits on Jul 14, 2018

Use central angle in tolerance calculations for tracking.
Mikhail Bychek
committed
Use elevation flip to go near the zenith smoothly(requires 180+ degrees elevation capability).
Mikhail Bychek
committed