Add BOUNDARY_CHECK option to OPI

Make the check of CD and CR boundaries an input option for OPI interface.

• Created a BOUNDARY_CHECK option in the OPI interface
• Set to True by default. Checks that CD >0 and Cr<2.
• If set to False, it only checks that CD <0.

Fix corner case in integration

• Properly handle reset state in the integration when use as a library.

Fix 3rd body covariance propagation

• Error in calculation of 3rd body partial derivatives was fixed
• Should lead to minor improvementes in Covariance accuracy
• Significant improvement in STM accuracy

Make C_d and C_r boundary checks optional

• C_BOUNDARY_CHECK was added as setting
• True by default
• If set false c_r and c_d boundary violations are ignored

Allow STM output

• Allow to output the STM instead of the covariance matrix
• Make pfUnit tests optional to avoid issues when using neptune as a library

Improved manoeuvre handling and fixes to the ocean tides model

• Manoeuvres are now also considered properly when propagation backwards
• Gravity model has been updated to fix the ocean tide model
• Unit tests have been added

v2022-02

Increased the number of maneuvers that can be set via OPI from 5 to 20.

Includes bug fixes for

• rare case of maneuvers causing considerable deviations caused by wrongful reset of the integrator
• OPI interface, where maneuver start epochs were set with low precision

v2021-11

• Contains fix for cases where the integration went into an infinite loop while overstepping a maneuver beginning or end

v2021-09

Added ITRF initial state support
Added support for newer JB2008 data files
Fixed infinite integration loop for some requested epochs

v2021-04

• Added support for Flang (AMD) compiler
• OpenMP parallelization works with gfortran-8 now
• Documentation is now disabled by default. It can be enabled via CMAKE: -DBUILD_DOCUMENTATION=ON