Pass parameters that will not be fitted to morpheus
It might be useful to pass parameters that don't need fitting but may have to be changed in morpheus for a certain condition. E.g. we have the case that we have different conditions, which are fairly similar regarding the morpheus simulation, but still we need to adapt the simulation time. We think it might be convenient to set this in the fitmulticell/pyabc script and then pass this to morpheus.