permuteLabels function returns a mixedMemModel object where the labels (for $\theta$, $\phi$, $\delta$ and $\alpha$) have been permuted
according a given permutation of the integers 1 through K. The findLabels function can be used to find a permutation of the labels which
most closely matches another fitted model.
permuteLabels(model, perm)mixedMemModel object which will be relabeled.mixedMemModel object such that
group i in the returned mixedMemModel object corresponds to group perm[i] from the input mixedMemModel object.permuteLabels returns a mixedMemModel object such that
group i in the returned mixedMemModel object corresponds to group perm[i] from the input mixedMemModel object