GLM factorial analysis

[John Darrington]

I've pushed a number of changes which together allow the GLM command to
accept interactions between factors.

The only problem is, that the answers are wrong :(

The sum of squares for factors with interactions are correct, and all the 
degrees of
freedome are correct.  Unfortunately the ssq for factors without interactions 
are 
wrong (my experiments showed 3.0 and 3.5 times too high) if the analysis also 
includes interactions between those factors.

However, if the analysis is run on the individual variables, without the 
interactions,
then the results are correct.  

So I think the get_ssq function needs some more work.

J'



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