factored aps_wide_post_process out of aps_wide
removed redundant call to assess_node
implemented the simplex-in-a-box search

it results in way too many chisquared calls being devoted to APS

might need to implement a time limit on find_global_minimum
implemented find_global_minimum with limit
added diagnostic statements so that we can tell if box is improving chisq
starting to work...
seem to have a combination of aps searches that works