add support for labeling bad sections. This can be useful if you have damaged tissue or a few sections of hemibrain data. Rather than exclude these data or have them stuff up the propagation we can instead label them as damaged and have their position propagated from the other intact sections. It only propagates the position and angle but keeps the original width and height, this may still be inaccurate if the section is highly damaged and for this we recommend QuickNII corrections.