The printImg method has now a tabulator as seperation sign instead of space.
Added thresholdDivisor parameter to preprocess method to change the threshold depending on the used image.
Now we ignore the borders in the accumulator array, because we aren't interessted in edges at the borders.
We wrote the methods drawLines and drawLine to draw the detected lines into the image.
Now we measure the time to see how long the computer needs to compute everything.