New model families

[jsocolar]

This issue is to aggregate various requests for new families:

Two level models

• Single season, including refactor of the data augmented model
• Multiseason, with series nested entirely within the upper level. All four multiseason types

Waiting time likelihoods

• Single season
• Multiseason x4
• All forms of 2-level model

Known false positive probabilities

• Single season
• Multiseason x4
• All forms of 2-level

N-mixture

• Poisson-binomial
• Poisson-betabinomial
• Negbinomial-binomial