Use the opposite constraint axis inside the constraint solver for the second object (-normal).

This makes it easier to port existing constraints and makes it 100% compatible with ODE quickstep constraint layout (getInfo2)

Demos/Benchmarks/main.cpp

@@ -27,9 +27,9 @@ int main(int argc,char** argv)
 	GLDebugDrawer	gDebugDrawer;
 
 //	BenchmarkDemo1 benchmarkDemo;
-//	BenchmarkDemo2 benchmarkDemo;
+	BenchmarkDemo2 benchmarkDemo;
 //	BenchmarkDemo3 benchmarkDemo;
-	BenchmarkDemo4 benchmarkDemo;
+//	BenchmarkDemo4 benchmarkDemo;
 //	BenchmarkDemo5 benchmarkDemo;
 //	BenchmarkDemo6 benchmarkDemo;
 //	BenchmarkDemo7 benchmarkDemo;