Removed changes.txt

changes.txt is superseded by changes.md
Deleted readme.txt

readme.txt is superseded by readme.md
ChartWindow with x-axis categories

This wasn't working due to some earlier changes (regression testing
would pick it up – any volunteers?). It should now work well.
Added a working between-subjects univariate ANOVA

This code works better than the old routine. Results are returned as a
dictionary which makes way more sense than either an object or a set of
unassociated values.
Three+ condition tests working

Between-subjects ANOVA now added and the dialog for 3+ conditions tests
should work.
Can handle ANOVA output

Added 2 functions for between-subjects and within-subjects ANOVA
routines. These functions format the output of their respective ANOVA
nicely.
Updated dialog to run properly

The earlier version didn't format data properly for between-subjects
ANOVA. This should now work with 1 variable the independent (grouping)
variable and the other the dependent variable (data).