suzerain: add Re_tau curve

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@45412 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: update gplot

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@45413 0bd85f0b-c151-43b9-a1e9-27231104551f