Changed cron_daily.php to avoid some php notices.

- Implemented FS#3308 - PATH placeholder in directive snippets (placeholder is named {DOCROOT}, like for nginx).

Changed mode of web folder from 0710 to 0711 to make it comaptibe with servers that use NFS for /var/www.

Changed: apps vhost is now a template (for apache version)
Changed: template if tags can now be of format 'version' to make version comparisons (e.g. 2.12 > 2.2 !)
Changed: New apache 2.4 syntax for deny from all (-> Require all denied) etc.

Outdated warning for clamav is only shown with warning level in monitor when the daily.cfd update failed as well.

- Added options to use a mounted backup directory. This allows for remote backups, e.g. vis sshfs to a backup server. The backup script checks if the backup directory is mounted, and if not, tries to mount it.

- nginx: added {DOCROOT} and {FASTCGIPASS} placeholders to directive snippets and nginx Directives fields.