* Refactoring, backup/restore, multi-instance
* Use dedicated system user, backup before upgrade
* Set directory rights (fixes#31), point to localhost (fixes#29), use up-to-date php-fpm.conf
* Install dependencies when restoring
* Set Wallabag URL in internal settings
* Fix upgrade, use more forthcoming helpers
* fix#32, use latest mysql helpers
* Small fixes (redundant file, up-to-date check_process, syntax correction on app.src)
