Returns the migration probability for age interval [Age,Age+AgeInterval). If AgeInterval is not specified it defaults to 1.0. Migration probability \(_n q_x\) is given by the expression \begin{equation} _n q_x = \frac{_n d_x}{l(x)} \end{equation} where \(_n d_x\) is the number of out-migrations from Age \(x\) for AgeInterval \(n\) and \(l(x)\) is the migration survival fraction. The optional argument ToPop is a comma-separated list of population codes possibly prefixed by '~' to denote the complement. If MigrationHandle is a multiple transition migration and ToPop is specified then the function returns the population-specific migration probability \begin{equation} _n q_{\topop x} = \frac{_n d_{\topop x}}{l(x)}, \end{equation} the probability of migrating to population \(\topop\) in age interval [Age,Age+AgeInterval).
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