Do Not Merge Fix graph

This PR replaces PR #314, which I will delete.  My graph got messed up and this PR contains all the previous changes plus work on uw2.rst.  There will be questions embedded in the uw2 changelines.
This line is essentially a variable definition for "|UW2|", which attempts (and fails) to create a superscripted UW^2 wherever "|UW2|" appears.  If we figure out how to do it we need only change it here.  Currently it appears as "UW2".