Order axis variables by separation between one class and the rest (most separation to least).
singleClassOrder(classVar, axisVars, specClass = NULL)class variable (vector from original dataset)
variables to be plotted as axes (data frame)
character string matching to level of classVar; instead
of looking for separation between any class and the rest, will only look for
separation between this class and the rest
character vector of names of axisVars ordered such that the first variable has the most separation between one of the classes and the rest, and the last variable has the least (as measured by F-statistics from an ANOVA)