largo: #2975 #2976 add mean methods for RANS

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suzerain: #2979 draft packing

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suzerain: stub NRBC c tests

No additionally testing has been added, just a confirmation
that the stubbed additions break nothing.

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suzerain: fix index of upper state scalar

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suzerain: enable degenerate testing

Here, the additional NRBC details are all zeros.

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