Some radii of spontaneous active neurons became zero size

minRadius described in parameter file is not effective so some radii of
spontaneous active neurons became zero size.

1. minRadius was referred in compileHistories method, but the value was
not set correctly.
2. Actually all values related to growth parameter were not set in
SimulationInfo. These values are set in growth structure in LifModel
class.
3. I eliminated all growth parameters from SimulationInfo, and use
these values in growth structure.