suzerain: update for new gplot arguments

This changed from -p to -o awhile back.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44049 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2979 permit OPER selection

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44050 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2979 update postproc

log.dat no longer contains the "bc.lower.d0" and friend messages.
They go into bc.dat from which gplot can easily plot them.  Happily,
we can drop the verbosity now as a result.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44051 0bd85f0b-c151-43b9-a1e9-27231104551f