Please doxygen (which quite rightly complained)

         * @param initial_time Initial time passed before propagation starts in local time coordinates

         * @param random_generator Reference to the random number engine to be used

         * @param output_plot_points Reference to vector to hold points for line graph output plots

         * @param charge Total charge of the observed charge carrier set

         * @return Tuple with the point where the deposit ended after propagation, the time the propagation took, the

         * cumulative gain and the final state of the charge carrier at the end of processing

         */