test case for layer numbering

benchmarks/extrude/test_layers_numbering.geo

+lc = 0.1;
+
+Point(1)={0.0,0.0,0.0,lc};
+Point(2)={1.0,0.0,0.0,lc};
+
+Line(1)={1,2};
+
+Extrude Line { 1, {0,0.1,0.0} }
+{ Layers { {10,10}, {10,20}, {0.2,1} };
+ Recombine;
+};
+
+Extrude Point { 1, {0,-0.2,-0.3} }
+{ Layers { {10,10}, {11,21}, {0.2,1} }; };
+
+
+Extrude Surface{ 5, {0,0.1,0.6}}
+{ Layers { {10,10}, {110,210}, {0.2,1} }; Recombine; };