Users can route wire manually if
automatically routing result is not satisfied.
Click 'Line Edit' button.
Place the cursor on the line needs to be routed,
press Mouse-Left-Button, don't release, and move the mouse. Release mouse
when the line has reach the proper position.
If you don't like the edited line, simple press
Mouse-Right-Button on the line corner. The corner disappears and the line is
straighten.
