check_pars: Check mbd pars
In Giappo/mbd: Multiple Birth Death Diversification

Check mbd pars

check_pars(
  pars,
  safety_checks = TRUE,
  lambda_limit = 10,
  mu_limit = 10,
  nu_limit = 100,
  q_threshold = 0.001
)

`pars`	vector of parameters: pars[1] is lambda, the sympatric speciation rate; pars[2] is mu, the extinction rate; pars[3] is nu, the multiple allopatric speciation trigger rate; pars[4] is q, the single-lineage speciation probability;
`safety_checks`	TRUE if you want the parameters to be limited to a realistic, but not infinite, parameter space
`lambda_limit`	Upper limit to lambda estimations.
`mu_limit`	Upper limit to mu estimations.
`nu_limit`	Upper limit to nu estimations.
`q_threshold`	adds a threshold for the evaluation of q. This is due because you never want `q` to actually be equal to zero or one.