suzerain: ignore 2point in idempotence

Including it is sane, but requires tweaking tolerances.
Assuming everything else goes through okay, the
two point repeatability should be a moot point.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44756 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: adjust tolerances for twopoint_k{x,z}

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44757 0bd85f0b-c151-43b9-a1e9-27231104551f