Revision history for Statistics-Running

0.13	2019-02-16
	Added sum(), abs_sum() subs.
	Added mean() to pod.

0.12	2018-12-20
	Fixed histogram-recalculate bugs

0.03	2018-12-20
	Added histogram_enable(), histogram_disable() and
	histogram_reset() and enhanced histogram functionality

0.02	2018-12-19
	Make tests work for perl version < 5.10 by replacing
	the defined-or operator: //

0.01    2018-12-18
        First version, released on an unsuspecting world.