suzerain: wording

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@42720 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: add check_euler_conserved

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@42721 0bd85f0b-c151-43b9-a1e9-27231104551f