suzerain: rename figures to cevisslam

Better matches the command line arguments, and will
provide some consistency with turbulent figures later.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44447 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: Re_theta on first, H on second

Tweak the presentation of the CEV summary plots

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44448 0bd85f0b-c151-43b9-a1e9-27231104551f