Merge pull request #5 from bricebou/master

Update for multicolumns output and alphabetical sort, using config.php
Removing a variable declaration
Adding alphabetical sorting to tags lists in article/blog post pages (http://momh.fr/tutos/Linux/birthday) and in tags lists in tag pages (http://momh.fr/tag/console)
Update for alphabetical sorting. Still a mystery : local WampServer vs production server