Rename calcMetrics to calc_metrics throughout so that it is more consistent stylistically with other functions in project.
Update calc_metrics_bisect() function to incorporate the random_shuffle() function.
Update random_shuffle() so that when bisection variograms are wanted it only returns a single metric.
Compute bisection variograms rather than traditional variograms.
Minor edits to calc_metrics_bisect() to better handle the nperm argument.
Update these scripts to perform with the new calc_metrics_bisect() function.