WIP: Re-group the covariance transport
Since the EigenStepper
and the StraightLineStepper
use the same math to transport their covariance matrices this MR merges both into a single file. Additionally the workflow is slightly changed to make the individual steps clearer and more maintainable (wrt !653)
The MR is a piece of !692 (closed).
Edited by Robert Johannes Langenberg