This script will calculate I^s scores, as described in (Hinchliff, C. E. and E. H. Roalson. 2012. Using supermatrices for phylogenetic inquiry: an example using the sedges. Systematic Biology). It requires a set of trees sharing a common set of tips, to be input as a newick file (though any format readable by dendropy should be trivial to use, just change the format in the appropriate line). It outputs a comma-delimited table containing the raw instability scores (the numerator from the right side of the equation in the referenced paper), as well as the scaled I^s scores. Taxa that move more have higher scores
