constants module

Define some constants.

markdown: dict[str, str] = {   'alpha': '$\\alpha$ [ns$^{-1}$]',     'collision_angle': 'Impact angle $\\theta$ [deg]',     'collision_energy': 'Collision energy [eV]',     'e_acc': '$E_{acc}$ [V/m]',     'emission_energy': 'Emission energy [eV]',     'population': '$n_e$',     'time': '$t$ [ns]'}

Associates name of variables in the library to markdown formatted strings