sample_path             Sample path from the distribution of an
                        endpoint-conditioned CTMC.
sample_path_mr          Simulate a sample path from an endpoint
                        conditioned CTMC by modified rejection
                        sampling.
sample_path_unif        Simulate a sample path from an endpoint
                        conditioned CTMC by uniformization.
sample_path_unif2       Simulate a sample path from an endpoint
                        conditioned CTMC by uniformization using
                        pre-computed eigen-values.
