Flexibly implements Integral Projection Models using an expression
based framework. This will not abstract away the model selection process,
but it will make sure you get everything after that correct. It handles density
dependence and environmental stochasticity, with a couple of options for
implementing the latter. In addition, provides functions to avoid unintentional
eviction of individuals from models. Additionally, provides model diagnostic tools,
plotting functionality, stochastic/deterministic simulations, and analysis tools.
Integral projection models are described in depth by Easterling et al. (2000)