 Usage:  d = vec2mat(v)  
 
 Input:

  v                      n(n-1)/2 x 1 matrix containing the values of the 
                         upper triangle of a symmetric matrix 
                         
                         
 Output:

  d                      n x n symmetric matrix with zeros in the diagonal 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
