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?

[MarieLataretu]

I actually have an other datatable extension request:
Nextclade_pango from nextclade output (available from version 1.11)

If the clade is labeled as recombinant, one can looke this up easily