copied posterior_from_hyper_cubes.cpp into a method of aps_extractor class
fixed sample_posterior method in aps_extractor
runs
allow it to print the minimum point
now mcmc_extractor also keeps track of minpt
something is terribly wrong with mcmc_extractor.cpp
fixed; I had declared min_pt as an array of ints... bah
added function to mcmc_extractor to plot how min evolves with time
added cutoff to aps_extractor