tests updated, random sample positions implemented

.gitattributes

dev.ipynb

dev.pyx

docs/reference/st_params_ref.rst

docs/tutorials/1d_sim.rst

docs/tutorials/diatom.rst

docs/tutorials/st_sim.rst

pyrost/bin/beam_calc.pyx

pyrost/bin/st_utils.pyx

pyrost/config/parameters.ini

pyrost/data_processing.py

pyrost/simulation/st_sim.py

pyrost/simulation/st_sim_param.py

tests/conftest.py

tests/test_pyrost.py