Stabilize Phase Range exploitation

[gwbres]

Phase Range Navigation is selected with Method::PPP and is currently 50 % completed.
The basis is there, we need to conclude all calculations, which should provide PPP for at least "ideal scenarios" (good conditions and performant receivers).

Phase range navigation is complex due to the possible perturbations that may happen.
We need good analysis, smart decision making, yet try to maintain things simple and efficient.