Osso-backup support: instead of backing up the .modest folder, backup a tar.gz (fixes...

[modest] / src / hildon2 / modest.conf

<backup-configuration>
  <locations>
    <location type="file" category="emails" auto="true">/home/user/.modest-backup.tar.gz</location>
    <location type="dir" category="emails" auto="true">/var/lib/gconf/apps/modest</location>
  </locations>
</backup-configuration>