[vtkusers] Bug report about vtkLine.cpp

[徐志華]

The Common Datamodel vtkLine.cpp has the following paragraph for calculating
distance between two lines,

---------------------------------------------------------------------------

  const double    D = a*c - b*b;       // always >= 0

 

  // compute the line parameters of the two closest points

  if (D < 1e-6)

    {         // the lines are almost parallel

----------------------------------------------------------------------------
-

for rather small line segments, the a*c and b*b maybe very small compare to
1e-6, which case, the used criterial for almost parallel may cause error,

maybe the D<1e-6 is better use floating criterial value.

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