Since file() doesn't remove "\n" from the lines read the condition
`$lines[$l] == ''` never evaluated to true.
So $mailHeaders would always contain every line from the template while
$mailBody contained none of them.

Together with the bugfix of PHP#68776 [1] disallowing multiple "\n"'s &
preceding "\n" in mail()'s $additionalHeaders arg this caused mails not
being sent because $mailHeaders would include at least one "\n\n" which
was meant to separate the mail headers from the body.

[1] https://bugs.php.net/bug.php?id=68776

Removed backup_dir_mount_cmd option from Sysstem > server config. The option has been replaced by a script /usr/local/ispconfig/server/scripts/backup_dir_mount.sh. If this script exists, is exacutable and is owned by the root user, then it will be executed upfront of the backup jobs when the option "Backup directory is a mount?" is enabled in server config settings.

Changed cron_daily.php to avoid some php notices.

- 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.

- Implemented: FS#3110 - Turn monitoring module into cron jobs

http://www.howtoforge.com/forums/showthread.php?t=62691

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

Links removed from sum rows in stats

- Added overtraffic notifications to traffic quota system (part of FS#2059 - Extend Traffic quota system)

- install: touch auth.log
- login: write success/fail to auth.log
- cron: log rotation for auth.log