Feature/noise options
This MR adds two new options to the white noise forcing:
-
UPDATEFREQ
: frequency (in time steps) for recomputing the noise -
NSTEPS
: number of time steps to apply the forcing
Also, the seed used to generate the noise is now changed each time it is called. This avoids always creating the same "random" noise (in the current implementation, the noise is not only constant in time, but it is also the same for all components).