fill_fertility: Combine prior and data for fertility matrix
In atyre2/raretrans: Bayesian Priors for Matrix Population Models

fill_fertility returns the expected value of the fertility matrix combining observed recruits for one time step and a Gamma prior for each column.

fill_fertility(
  TF,
  N,
  alpha = 1e-05,
  beta = 1e-05,
  priorweight = -1,
  returnType = "F"
)

`TF`	A list of two matrices, T and F, as ouput by `projection.matrix`.
`N`	A vector of observed stage distribution.
`alpha`	A matrix of the prior parameter for each stage. Impossible stage combinations marked with NA_real_.
`beta`	A matrix of the prior parameter for each stage. Impossible stage combinations marked with NA_real_.
`priorweight`	total weight for each column of prior as a percentage of sample size or 1 if negative
`returnType`	A character vector describing the desired return value. Defaults to "F" the fertility matrix