suzerain: #3078 account for baseflow sources in temporal consistent

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suzerain: #3078 style edits

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suzerain: #3078 add FIXME for tconsistent

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suzerain: #3079 increase \mean{ru"u"} robustness

In a continuous setting, these values cannot be negative.
Discretely they are noisy, so enforce zero as a lower bound.

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