Add correct length and correct 3D algorithm, as with old Delaunay (Tetgen) it...

Add correct length and correct 3D algorithm, as with old Delaunay (Tetgen) it couldn't create the 3D mesh.

benchmarks/occ/occ_sphere.geo

-// This example shows the possibility of inserting embedded points and lines on
-// periodic surfaces
-
 SetFactory("OpenCASCADE");
 Sphere(1) = {0, 0, 0, 0.5, -Pi/2, Pi/2, 2*Pi};
 
-Characteristic Length {1, 2} = 1.0;
-Mesh.CharacteristicLengthFactor = 1.0;
+Mesh.CharacteristicLengthFactor = 0.99;
 
 Mesh.Algorithm = 6; // Frontal
+Mesh.Algorithm3D = 2; // New Delaunay
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