Probnum

New Features
- Step size perturbation for differential equation solvers (376)
- Wrappers for SciPy Runge-Kutta methods with manual step size selection (380)

Benchmarks
- Filtering and smoothing (373)
- Linear operators (385, 390)

Refactoring
- Linear operators now use a compositional pattern (381)

Bug Fixes
- Stabilization of linear solves in discrete transitions (386)
- Performance of Kronecker matrix matrix multiplication (391,392)

New Features
- Basic Bayesian Quadrature (375)
- Interface for Random Processes (356)
- Continuous time smoothing for linear SDEs (371)

Testing
- Improved test infrastructure for linear operators using `pytest-cases` (366)

Fixes
- Dense output sampling (365)

* Dynamic diffusion and error estimation