Pyerrors

Added
- Explicit checks of the provided inverse matrix for correlated fits 259

Changed
- Compute derivative for pow explicitly instead of relying on autograd. This results in a ~4x speedup for pow operations 246
- More explicit exception types 248

Fixed
- Removed the possibility to create an Obs from data on several replica 258
- Fix range in `set_prange` 247
- Fix ensemble name handling in sfcf input modules 253
- Correct error message for fit shape mismatch 257

Added
- Allow providing lower triangular matrix constructed from a Cholesky decomposition in least squares function for correlated fits.

Fixed
- Corrected bug that prevented combined fits with multiple x-obs in some cases.

Changed
- Support for numpy 2 was added via a new autograd release
- Support for python<3.9 was dropped and dependencies were updated.

Fixed
- Minor bug fixes in input.sfcf

Fixed
- Fixed a bug in error computation when combining two Obs from the same ensemble and fluctuations on one replicum are not part of one of the Obs.

Added
- New special function module.

Fixed
- Various bug fixes in input module.

Added
- More efficient implementation of read_sfcf
- added support for addition and multiplication of complex numbers to Corr objects
- the Corr.GEVP method can now also propagate the errors for the eigenvectors

Fixed
- Fixed bug in combined fit with multiple independent variables
- Check for invalid set of configuration numbers added when initializing an Obs object.
- Fixed a bug in hadrons.read_hdf5