Log Histogram

[afrodri]

Histogram statistics are useful, but often require an inordinately large number of bins. There are cases where fixed linear bin widths (e.g. 1-10,11-20,21-30,...) are not necessary and logarithmic bins could be used (e.g. 0-1,1-2,3-4,5-8,9-16,17-32). A new logHistogram statistic type could address this.

[jjwilke]

Did anything happen with this?

Do we want a new LogHistogram object? Or an option to the existing histogram to do things logarithmically?

This might be as easy as virtualizing the addData_impl function to pass through log values to the original addData_impl in the regular histogram.

Related to #381