a bunch of print and diagnostic statements related to the 4_5 and 0_3 contours
aps_focus based on corners; centered on chimin
added code to hopefully prevent focus from constantly picking the same point over and over again
typo
terminate if bisection gets flow and fhigh wrong
be more deliberate about what happens if the corner you choose is a bad candidate
had to make sure that if we are just randomly doing the focus sampling, the whole system did not break down
needed to keep track of focus_pts
factored out random_focus and corner_focus
if corner search fails, propose a point that is displaced perpendicularly from the corner