Given a set of CP parameters (of "ppersist"
type),
calculate the probability of persistence to detection for a carcass.
ppersist(pda, pdb, dist, t_arrive0, t_arrive1, t_search)
parameter a.
parameter b.
Distribution used.
Beginning of arrival window.
End of arrival window.
Search time.
Probability of persistence of detection to at t_search, given arrival between t_arrive0 and t_arrive1