[patch #6650] one pass covariance algorithm

[John Darrington]

Follow-up Comment #7, patch #6650 (project pspp):

It looks good.

But I think it can be simplified by having the 
struct hsh_table , struct moments1, and the struct variable array (and
possibly other things) all encapsulated into one single struct which gets
passed to covariance_accumulator_to_matrix, covariance_create and
covariance_acculumlate.  

This would make the calling code (such as glm.q) a lot simpler.


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