obj_parent_reparam: A reparameterization of 'obj_parent'
In dcgerard/updogAlpha: Using Parental Data for Offspring Genotyping

A reparameterization of obj_parent

1 2	obj_parent_reparam(pcounts, psize, ploidy, pgeno, s, ell, r, weight = 1, outlier = FALSE, out_prop = 0.01)

`pcounts`	The number of counts of the reference allele we observe in a parent.
`psize`	The total number of reads we observe in a parent.
`ploidy`	An integer. The ploidy of the species. This is assumed to be the same for each individual.
`pgeno`	The genotype of the parent.
`s`	Same as `log(bias_val)` in `obj_offspring`.
`ell`	We have `seq_error = expit(ell)` from `obj_offspring`.
`r`	Same as `log((1.0 - od_param) / od_param)` from `obj_offspring`.
`weight`	A double between 0 and 1. This should only not be 1 when doing the em algorithm and the weight is the probabiility that a point being ok.
`outlier`	A logical. Should we include an outlier model (`TRUE`) or not (`FALSE`)? Defaults to `FALSE`.
`out_prop`	The proportion of points that are outliers. Defaults (quite arbitrarily) to `0.01`.