Added a force parameter to the clearLabels method. This way all labels can be deleted.
Added a force parameter to the clearLabels method. This way all labels
can be deleted.

mcanthony/jit,shelsonjava/jit,philogb/jit,pingjiang/jit,tim777z/jit,pingjiang/jit,mcanthony/jit,mcanthony/jit,shzy2012/jit,shelsonjava/jit,printedheart/jit,philogb/jit,shzy2012/jit,pingjiang/jit,shzy2012/jit,tim777z/jit,shelsonjava/jit,printedheart/jit,tim777z/jit,printedheart/jit