* Statistic page is now more clean with 0 or 1 values (for new Piwigos)
* Rectification of a mistake in functions_mysqli.inc.php (replace 'groups' by 'rank')
* Number of years compared is a configuration variable (default 5)
* Months compared are the actual, the last and the actual month the last year (you can also visualize the average last 12 months)
* Statistic page totally redesign, replace by a single graphic which display for last hours, days, months and years
* Add Chart.js plugin for graphic representation
* Add Moment.js plugin for time operations
Zacharie