Issue 888
- Definition of the Abstract modifier for the relativistic J2 clock delay
- Definition of the InterSatellites, OneWayGNSS, Range, Phase modifiers.
- Definition of the tests
The tests provide a behaviour consistent with what is expected. The value obtained during tests seem consistent with the value presented in the reference. The coverage computed by SonarQube on the code specific to this branch is 100% and the duplication present from the new code is equal to 0%.