Merge branch 'dev0' into dev-maxwell

docs/conf.py

docs/reference/classes/st_data.rst

docs/tutorials/diatom.rst

pyrost/abberations_fit.py

pyrost/bin/beam_calc.pyx

pyrost/data_container.py

pyrost/data_processing.py

pyrost/simulation/st_sim.py

setup.py

tests/test_pyrost.py