updated Makefile for mcmc_test.cpp
added mcmc_test.cpp
added test to clean statement
added mcmc_s_curve
scurve ready to run
added ability to specify range when generating random basis
added mcmc_extraction_runner.cpp
scurve_extract compiles
s_curve_extractor is up and running

put some print statements in mcmc.cpp and mcmc_extractor.cpp

fewer thinval steps in mcmc_extractor.cpp
reinstate gibbs sampling
added plot_as_aps to mcmc_extractor.cpp
s_curve analyzer codes have been directed to appropriate output directories
some changes to aps_extraction code
removed print statement from update_directions
removed some print statements
added get_n_active_nodes