EDIT

ref #8771 unit test for significant figures of statistical values

fixing PHPUnit setup for php 7 and documenting its usage with PHPStorm

fix #8771 removing comment

fix #8771 display of average value with minimum amount of significant figures

ref #8786 renaming all min_max_() functions to statistical_values_()

ref #8739 updated explanatory text for statistical values

ref #8786 improved display of min, max, mean and other statistical values

typos in README

ref #8787 uncommenting previously implemented improved display of exact values

ref #8739 indenting description table entries by character hierarchy - bugfix