Document selfing/cloning rate fuzziness

[jeromekelleher]

Pragmatically we can't enforce that selfing and cloning must be with or without replacment and so we should remain agnostic.

It's a 1/N effect anyway, which is usually considered negligible.

Related to #43 #33

[MattHartfield]

Might be worth also noting that there's also a 'residual cloning' effect; even with cloning_rate = 0, a cloned offspring will be produced with probability 1/2N

[apragsdale]

even with cloning_rate = 0, a cloned offspring will be produced with probability 1/2N

Is that the case? I guess I don't know cloning models too well, but I thought that cloning would occur with probability cloning_rate, in which case you pick a single parent and fully copy its genome (without any recombination) into its offspring. If cloning rate is zero, even if you pick the same parent twice (i.e., a selfing event), meiosis still occurs, but you'd never have the case where an individuals entire genome is copied in full from one generation to the next.

[MattHartfield]

Admittedly the logic I outlined above was for the case with no recombination, I was working on the probability that a neutral WF model will 'choose' the second allele copy from a diploid individual, conditional on the first already being chosen for an offspring.