Fixing a bug on Visualizer Camera and a few more

- resetDebugVisualizerCamera now accepts negative values for pitch and
yaw angles

- Defining kitchen model to be concave, so as to be able to put floating
objects inside

- Fixed an indention error in testrender_np.py

examples/pybullet/pybullet.c

@@ -3055,8 +3055,8 @@ static PyObject* pybullet_configureDebugVisualizer(PyObject* self, PyObject* arg
 static PyObject* pybullet_resetDebugVisualizerCamera(PyObject* self, PyObject* args, PyObject *keywds)
 {
     float cameraDistance = -1;
-	float cameraYaw = -1;
-	float cameraPitch = -1;
+	float cameraYaw = 35;
+	float cameraPitch = 50;
 	PyObject* cameraTargetPosObj=0;
 
     int physicsClientId = 0;
@@ -3076,7 +3076,7 @@ static PyObject* pybullet_resetDebugVisualizerCamera(PyObject* self, PyObject* a
    
     {
         b3SharedMemoryCommandHandle commandHandle = b3InitConfigureOpenGLVisualizer(sm);
-		if ((cameraDistance>=0) && (cameraYaw>=0) &&  (cameraPitch>=0))
+		if ((cameraDistance>=0))
 		{
 			float cameraTargetPosition[3];
 			if (pybullet_internalSetVector(cameraTargetPosObj,cameraTargetPosition))