| Calculate the flat-bottom quadratic energy potential. The formula used is: 
                       / (x - x+)^2    if x > x+,
                       |                         
   V_pQuad(x;x+,x-) = <  (x - x-)^2    if x < x-,
                       |                         
                       \ 0             otherwise.
Where x+ and x- are the absolute bounds. 
    Parameters:
        values(numpy float array) - An array of values of x.pot(numpy float array) - The array to place the potential values (V_pQuad) into.  This 
          should have the same dimensions as the values array.lower(numpy float array) - The array of lower bounds.  This should have the same dimensions 
          as the values array.upper(numpy float array) - The array of upper bounds.  This should have the same dimensions 
          as the values array. |