suzerain: #3010 isolate Re computations

For upcoming refactor supporting non-ZPG cases, I want
the Reynolds number computations to be isolated from other
QoI.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@42876 0bd85f0b-c151-43b9-a1e9-27231104551f