Split UCR into three categories

[sarahmish]

The UCR dataset encompasses three subcategories:

• Natural where no noise or distortion was added to the signal.
• NOISE where gaussian noise was added to the original signal

noise = temp + (rand(size(temp)) * (std(temp) / 10);

• DISTORTED where noise and a wandering baseline is added to the original signal

distort = temp + (smooth(rand(size(temp)),25) * std(temp));

where temp is the dataset