don't use 0.9, 0.1: it fails with some ruled surfaces

Geo/GFace.cpp

@@ -805,14 +805,15 @@ void GFace::XYZtoUV(double X, double Y, double Z, double &U, double &V,
 {
   const double Precision = onSurface ? 1.e-8 : 1.e-3;
   const int MaxIter = onSurface ? 25 : 10;
-  const int NumInitGuess = 11;
+  const int NumInitGuess = 9;
 
   double Unew = 0., Vnew = 0., err, err2;
   int iter;
   double mat[3][3], jac[3][3];
   double umin, umax, vmin, vmax;
-  double initu[NumInitGuess] = {0.5, 0.6, 0.4, 0.7, 0.3, 0.8, 0.2, 0.9, 0.1, 1., 0.};
-  double initv[NumInitGuess] = {0.5, 0.6, 0.4, 0.7, 0.3, 0.8, 0.2, 0.9, 0.1, 1., 0.};
+  // don't use 0.9, 0.1 it fails with ruled surfaces
+  double initu[NumInitGuess] = {0.5, 0.6, 0.4, 0.7, 0.3, 0.8, 0.2, 1., 0.};
+  double initv[NumInitGuess] = {0.5, 0.6, 0.4, 0.7, 0.3, 0.8, 0.2, 1., 0.};
 
   Range<double> ru = parBounds(0);
   Range<double> rv = parBounds(1);