suzerain: denote constness

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43774 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: remove BOOST_FOREACH usage

Unsure if these are giving Victor trouble, but there's
really no point to keeping them around.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43775 0bd85f0b-c151-43b9-a1e9-27231104551f