suzerain: #3004 code units in viscous QoI

This small set of notes accounts for code units within the
viscous unit computations of tau_w, u_\tau, and \delta_\nu.
These are consistent (I think) with the older postproc/channel.m
computations and represent fixes that need to be applied to
suzerain/bl.{h,c} to correct several current QoI.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@42828 0bd85f0b-c151-43b9-a1e9-27231104551f