increased stabilising parameters

growth_parameters.json

 {
     "dimension" : 1,
-    "resolution" : 200,
+    "resolution" : 500,
     "system_size" : 6.283185,
-    "diffusion_c" : 4.0,
+    "diffusion_c" : 10.0,
     "diffusion_rho" : 1.0,
     "turnover_rho" : 1.0,
     "turnover_c" : 2.0,
     "mean_concentration" : 0.5,
     "mean_density" : 0.5,
     "timestep" : 0.01,
-    "maxtime" : 25.0,
-    "youngs_modulus" : 2,
+    "maxtime" : 20.0,
+    "youngs_modulus" : 10,
     "b": 1.1
 }