Adding options to analyze nominal Y's

1. Multiple-comparisons for nominal Y's (as for continuous Y's in Fit Y by X and in Fit Model).

2. Multi-way contingency tables for factorial layout of X's, and a nominal Y.

3. Contingency table: give proper titles to the last column and last row (e.g. "Y sub-total" and "X sub-total").

4. Contingency table: when "Col%" is requested, it should be presented also in the "Y sub-total" column and when "Row%" is requested, it should be presented in the row of "X sub-total".

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