suzerain: #3010 delta_1 bounds delta_99

As \delta_{99} should always be outside \delta_1 and the latter
is more robust than the former, use \delta_1 as a lower bound on
where we might find \delta_{99}.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43049 0bd85f0b-c151-43b9-a1e9-27231104551f