suzerain: add --statistics_stale flag

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44950 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: use bool_switch

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44951 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: enable --statistics_stale logic

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44952 0bd85f0b-c151-43b9-a1e9-27231104551f