finally get the leibniz window out of the way, jfc
put in enough characteristic-tracking stuff that the May SS seems to be behaving better, at least
fix old Leibniz rule labels
compute rank based on -findOrdersOf:in:, rather than the difference in rank of cycles and boundaries
we need to know the ambient characteristic to properly compute the visible ranks of terms
really, computing homology reps should happen once-per-page load
intermediate commit for the night. +assemblePresentation needs to be changed to use -columnReduceWithRightFactor instead of -image
rewrote -assemblePresentation. Ext Chart can now compute a sliced version of the integral KU HFPSS :)
fix an indexing error in May SS generation