- Updated Linux Distribution detection to recognize all wheezy sub versions correctly.

This reverts commit 4cd62d78.

- Make sure the correct sys_groupid is saved for web folders and web folder users.

Fixed: FS#3350 - [Dovecot] Warning: mysql: Query failed, retrying: Unknown column 'filter' in 'where clause'

Changed cron_daily.php to avoid some php notices.

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

Fixed issue with shell user creation due to missing parent user and group values in shell_user database records.