ExitTimes.iid: Compute distribution of times to quasi-extinction
In ashander/matrixmodels: Tools for analysis of matrix population (models)

Compute distribution of times to quasi-extinction

1 2	ExitTimes.iid(n.0, matrices, p, t.max, nreps, qe = 0, weight.sum = NULL)

`n.0`	initial number in stages
`matrices`	is a d^2 x s matrix, where d number of stages, s the number of matrixes
`p`	vector of probabilities for drawing each matrix
`t.max`	time to stop and compute population size
`nreps`	number of replicates to compute the distribution over
`weight.sum`	weighting vector for summation
`qe`	quasi-extinction threshold