[patch #6650] one pass covariance algorithm

[John Darrington]

Follow-up Comment #1, patch #6650 (project pspp):

Note that compare_values (from src/data/values.[ch]) now takes a variable,
not a width as it's 3rd argument.

Therefore, in serveral places where you've written

 compare_values (val1, val2, var_get_width (var));

this should be 

 compare_values (val1, val2, var);

instead.


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