A proportion dispersing function generates the proportions of species that disperse from cells based on landscape features.
The default set_proportion_dispersing function and parameters returns
full dispersal for all life stages. Additional proportion dispersing functions
are provided in the software for the user to select, however, a user may also
provide a custom written proportion dispersing function. Please see the tutorial
vignette titled "Creating custom *steps* functions" for information on how to
write custom functions for use in simulations.
set_proportion_dispersing controls the proportions of each life-stage that disperse
density_dependence_dispersing proportions of dispersing populations are controlled by approach to carrying capacity