* [fix] Fixed intendation for flake8
* [feat] special module with Bessel functions added.
* [feat] init adapted.
* [tests] First test for special module added.
* [tests] Check kn special function derivative explicitly vs numerical
derivative of scipy function.
* [feat] Added remaining autograd scipy special functions to the special
module.
* [feat] Imports corrected, docstring added.
* first example of returns statement in docstring
* added a some return statements for pandas API
* last return statements in pandas input
* added returns to bdio docstrings
* few returns statements added to docstring
* finished docstrings for hadrons submodule
* also finished docstrings for json submodule
* finished misc submodule
* added returns in docstrings in openqQCD
* made some cosmetic chanes to dostrings
* added return nad return statement in docstring
* linting
* Improved docstrings of mpm, fits, roots, misc to have return statements
returns added for misc.py
returns added for mpm.py
reutrns added for fits.py
* linting...
* Some polishing of docstrings
