[bugfix] Current time of a Transport instance is set to 0 at the

beginning of the growth simulation.

cellfile.py

@@ -825,6 +825,7 @@ class CellFile(object):
         for i, signal in enumerate(self.signals):
             transport_mechanism = signal.transport_mechanism
             transport = signal.transport
+            transport.time = 0  # make sure time is set to 0 for all transports
             conc_indices_i = []
             flux_indices_i = []
             for j, bcond in enumerate(signal.boundary_conditions()):