get_prob_geno: Rcpp function to get genotype probabilities assuming either...
In dcgerard/updogAlpha: Using Parental Data for Offspring Genotyping

Rcpp function to get genotype probabilities assuming either F1 population given parental genotypes, the allele frequencies assuming Hardy-Weinberg equilibrium, or just a uniform distribution.

1	get_prob_geno(ploidy, model, p1geno, p2geno, allele_freq)

`ploidy`	The ploidy of the species.
`model`	Do we assume the genotypes are distributed from an F1 population (`"f1"`), an S1 population (`"s1"`), according to Hardy-Weinberg (`hw`), or uniformly (`"uniform"`)?
`p1geno`	The first parental genotype if `model = "f1"`.
`p2geno`	The second parental genotype if `model = "f1"`.
`allele_freq`	The allele-frequency if `model = "hw"`.