Normalize histograms on Statistics page

The changes introduces in this pull request normalizes the height of the bars in the histograms on the Statistics page such that the highest bar is assigned a height of 100%.

This especially makes the more-or-less uniform distributions (where all bars have height close to 10%) more informative.
If the parameter “locallyOriginatingRequestsCount” is not used anymore, please remove it from the method’s signature, too.