Cleaned up the CeSymm and CEsymmGUI classes by removing commented out
code: it can always be recovered from version history. Also moved a
display method from CeSymm to CEsymmGUI.
Created the hopefully short-lived CensusDifferences and
TrivialAlignmentFinder.
Merge branch 'master' of https://github.com/dmyersturnbull/symmetry