expand focus box by 0.5/sqrt(dim) on either side
changes to aps_extraction_runner.cpp
added focus_metric function
use simplex to search focus box for maximum strad value
added some print statements so we could see what the focus simplex was finding
better tests of in_bounds
focus based on nn distance
focus based on straddle; run until it converges
how many iterations?
only allow focus simplex to go 1000 iterations without setting max
restore bisection for wide points
changes to aps_extraction_runner.cpp