5.9.1.0

The rprocess plugin onestep now always takes exactly one step to get from one observation time to the next, even when the interval between them is zero. That is, if P is a 'pomp' object with an rprocess built using rprocess=onestep(f), t0=timezero(P), and t=time(P), then f will be called exactly once for the interval (t0,t[1]) and once for each of the intervals (t[i-1],t[i]), i=2,...,length(t).