Private mutation from nextclade

[MarieLataretu]

Private mutation from the nextclade output can help to detect recombinants, mixed infections or contamination, see Twitter

We could add the following columns to the datatable: "privateNucMutations.reversionSubstitutions", "privateNucMutations.labeledSubstitutions", "privateNucMutations.unlabeledSubstitutions", "qc.privateMutations.status"

And maybe add also the qc.privateMutations.status in the html?