Birth death shift process (Ts)

This model allows the user to use simulate species tree with variable extinction and speciation rates. The model is better described here:

https://revbayes.github.io/tutorials/divrate/branch_specific.html

Parameters

SHIFT_SPECIATION_RATE_FREQUENCY/SHIFT_EXTINCTION_RATE_FREQUENCY

How frequent the speciation/extinction rate changes

BASE_SPECIATION/BASE_EXTINCTION

Distribution used to generate the different speciation/extinction rate values. So far, only lognormal and gamma distribution are supported

NUM_SPECIATION_RATE_CATEGORIES/NUM_EXTINCTION_RATE_CATEGORIES

Number of different speciation and extinction rates