Multiple Regression newSampleData methods inconsistently create / omit 
intercepts
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                 Key: MATH-411
                 URL: https://issues.apache.org/jira/browse/MATH-411
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 2.1, 2.0
            Reporter: Phil Steitz


The newSampleData(double[], nrows, ncols) method used in the unit tests adds a 
unitary column to the design matrix, resulting in an intercept term being 
estimated among the regression parameters.  The other newSampleData methods do 
not do this, forcing users to add the column of "1"s to estimate models with 
intercept.  Behavior should be consistent and users should not have to add the 
column.

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