Fixed: Mouse wheel should scroll target object instead scroll bar (fixes issue #327)

--HG--
branch : develop

code/nel/src/gui/ctrl_scroll.cpp

@@ -885,7 +885,7 @@ namespace NLGUI
 			}
 			if (eventDesc.getEventTypeExtended() == NLGUI::CEventDescriptorMouse::mousewheel && _Vertical)
 			{
-				moveTrackY (eventDesc.getWheel() * 12);
+				moveTargetY (-(eventDesc.getWheel() * 12));
 				return true;
 			}
 		}

code/nel/src/gui/interface_group.cpp

@@ -1305,7 +1305,7 @@ namespace NLGUI
 					CInterfaceGroup *currParent = _Parent;
 					while (currParent)
 					{
-						if (currParent->moveSBTrackY (this, eventDesc.getWheel()*12))
+						if (currParent->moveSBTargetY (this, -(eventDesc.getWheel()*12)))
 							return true;
 						currParent = currParent->getParent();
 					}