Fixed
* `numpy` deprecation of `np.float` (2)
Changed
* Creep correction: Both the `sin` and `root` creep corrections were re-derived with more strict constraints to prevent un-physical/nonsensical creep behavior.
* Added function constraints to documentation. The derivation of the creep functions is not part of this repo as of now.
Added
* Functions `sin_limit_function` and `root_limit_function` to automatically adapt the bounds for the optimizer when approximating the creep behavior in `sin` or `root` mode. This prevents `pyfastspm` from crashing / skipping the creep correction if bounds are defined too loosely.