suzerain: #3070 well-posed inflow

I had been using the ill-posed inflow from Medida without
realizing it.  This should automatically correct to use
Medida's suggested inflow regardless of the left-vs-right
boundaries while always using the unmodified outflow condition.
Presumably it degenerates to supersonic inflow or outflow as well.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44813 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #3070 remove rhome_xyz inflow warning

I believe I have this fixed as of the prior commit, so
removing the associated big scary warning on rhome_xyz.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44814 0bd85f0b-c151-43b9-a1e9-27231104551f