If the setting 'updates.check_updates' is disabled, do not retrieve the latest version on server administration page.
Additionally, updated default values for
- updates.check_updates from false to true
- updates.check_updates_branch from stable to latest
It contains mostly read only information about the current Shaarli instance,
PHP version, extensions, file and folder permissions, etc.
Also action buttons to clear the cache or sync thumbnails.
Part of the content of this page is also displayed on the install page,
to check server requirement before installing Shaarli config file.
Fixes#40Fixes#185
