Add "View Selected" (numpad .-key) for faceselect mode and the uv editor.

Also includes some 2d vector operations (subtract, dot, normalise).

source/blender/src/space.c

@@ -3835,6 +3835,10 @@ static void winqreadimagespace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 			case WKEY:
 				transform_tface_uv('w');
 				break;
+			case PADPERIOD:
+				if(G.qual==0)
+					image_viewcentre();
+				break;
 		}
 	}