• Fix #321: Boolean settings in presets caused errors when trying to store the preset's addressbooks to the database
• Fix #322: The refresh time string from admin presets was not converted to seconds, causing errors or wrong values when
  storing the preset's addressbooks to the database
• Fix #324: Changes not immediately visible with postgresql (delete contact, add/remove contact to/from group)
• Fix: spurious error returned when creating VCard on Google