extend_simulation: Continue a Previously Initiated Simulation
In petrelharp/landsim: Simulate Populations on Landscapes

Run a previously initiated popluation for more generations.

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extend_simulation(sim, population, demography, times, append = TRUE,
  N = sim$N[, , dim(sim$N)[3]], tinit = sim$t + 1, summary.times = (sim$t
  + 1):max(times), summaries = NULL, ...)

`sim`	The previous `simulation` object.
`population`	A `population` object, the initial state (t=0) of the population.
`demography`	A `demography` object, containing the below parameters.
`times`	A sorted integer vector of times to record the full state of the population at.
`append`	If TRUE, append results to results in previous simulation object.
`N`	Overrides the matrix of genotype counts in `population`, if present.
`tinit`	The current time at the beginning of the simulation (defaults to t=0).
`summary.times`	A sorted integer vector of times to record summaries of the population at.
`summaries`	A list of functions to apply to the matrix of genotype counts, population$N, at generations `summary.times`.
`...`	Additional parameters that will be passed to `generation()`.