Probability of a large outbreak based on values of R and k

[adamkucharski]

Add functionality to calculate the probability of a large outbreak (i.e. a branching process that fails to go extinct) following an initial introduction into the population, based on estimated values of R and k. This calculation was done for COVID under different introduction scenarios, and for different baseline assumptions (which could be drawn from epiparameter): https://cmmid.github.io/visualisations/new-outbreak-probability

These functions could also be expanded to include multiple age groups and integration with socialmixr using previously developed methodology for outbreak probability in multiple groups

[adamkucharski]

Function added for single-type branching process. Need to add another for multi-type branching process.

[joshwlambert]

After discussing this feature it was agreed that the multi-type branching process, with the possibility of multiple age groups is a low priority task.

Removing from v0.2.0 release plan.