Hardening ranking routine

The ranking routine worked well with lists but not arrays & matrices.
Introduced a way to deal with both.
Pairwise deletion routine, returned values, new KR

New Kruskal-Wallis test routine (tested against data in Siegal),
deleted the old routines; the 2-sample test functions now present
‘quotes’ to structure output as html & text; and a new pairwise
deletion routine is added.
New test routines added

New test routines (2 & 3+ sample tests) added to main body of code.
New dialog for correlations

This is a new dialog for correlations. It works on the same principle
as the 2 and 3+ samples dialogs except that there is no distinction
between within- and between-subjects tests.
Calculate ranks change

Changing the CalculateRanks routine to ensure that it returns values in
an ascending order.
Correlations changes + new Friedman test

Correlation routines return a dictionary of results rather than a set;
and a new test, the Friedman test for 2+ nonparametric samples, has
been written.
Correlations now integrated and Friedman's test

The correlations dialog is called and data can be analysed with them;
and the Friedman test is now operational too.