Make graph title, sub title, and file name
make_graph_title(filepath, parameter, graph_time, measure, measure_scale,
corr_stat, timepointscale)
Directory to output graph to
Current parameter being processed
Timepoint, if multiple timepoints
Current measure being processed
Scale of the measure being processed
The PRCC for this parameter-measure pair
Scale of timepoints, if multiple
List containing file, title, and subtitle, and axes labels