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

- Add config to clear php handler in apps vhost.

- 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.

Fixed login as

Reverted SVN trunk back to revision 3938 to remove changes in default theme an a replacement of the ispconfig logo.

- Added backup size to web backups

  New global option to grant reseller users access to the options (advanced) tab in web domains and vhost subdomains

 - added configuration options to server config (web tab, php section)
 - do not update custom php.inis if md5sum file does not exist

- Added check for the apps vhost to find out if the default PHP-FPM pool uses port 9000 or the socket /var/run/php5-fpm.sock.

avoid 400 bad request error if ssl is enabled and interface is accessed with http instead of https. Instead redirect to the requested page with https at the beginning of the URL.

According to FS#1982