Orbdetpy

Minor release in the 2.x.x series

Minor release in the 2.x.x series with bug fixes and performance speed-ups in the Python wrapper code.

This release completely eliminates the use of JSON files for specifying Python function parameters. The new interface uses a declarative syntax for functions. Take a look at the code under `examples` that demonstrates the updated interface and new capabilities.

New features:

1. The CPU intensive `propagate_orbits`, `simulate_measurements`, and `determine_orbit` may now be called asynchronously, which allows orbdetpy to use multiple CPU cores and hyper-threading. See `examples/run_tests.py` for an example of the caller-side changes needed to support multi-threaded synchronization. The UKF will automatically propagate sigma points in parallel without any additional user input needed.

2. Station measurement biases and other parameters may now be estimated or considered in the UKF. The EKF can only estimate Cd, Cr and DMC accelerations but not station biases.

3. Outlier detection may now be configured using the parameters in `docs/file_formats.md`.