Escape '%' sign in mrdna script help statements; thanks to Elija Feigl for the catch

bin/mrdna

@@ -57,9 +57,9 @@ parser.add_argument('--oxdna-steps', type=float, default=None,
 parser.add_argument('--oxdna-output-period', type=float, default=1e4,
                     help='Simulation steps between oxDNA configuration and energy output')
 parser.add_argument('--coarse-bond-cutoff', type=float, default = 0,
-                    help='Ignore bonds beyond this cutoff during 25% of coarse simulation, adding a step to the simulation. Default value of zero implies bonds are not ignored')
+                    help='Ignore bonds beyond this cutoff during 25%% of coarse simulation, adding a step to the simulation. Default value of zero implies bonds are not ignored')
 parser.add_argument('--coarse-persistence-length', type=float, default = None,
-                    help='Specify a custom persistence length (in nm) for the first 25% of coarse simulation (after coarse-bond-cutoff simulation if specified), adding a step to the simulation')
+                    help='Specify a custom persistence length (in nm) for the first 25%% of coarse simulation (after coarse-bond-cutoff simulation if specified), adding a step to the simulation')
 
 parser.add_argument('--crossover-to-intrahelical-cutoff', type=float, default=-1,
                     help='Set the distance (in Angstroms) beyond which crossovers between helix ends are converted to intrahelical connections; a negative value means no crossovers will be converted')