Fixed: Some widgets do not have space for validation error message
    
    https://fedorahosted.org/freeipa/ticket/1454
    
    The following widgets should call create_error_link() to create a space to show validation error messages:
    
      IPA.checkbox_widget
      IPA.checkboxes_widget
      IPA.radio_widget
      IPA.select_widget
      IPA.table_widget
      IPA.attributes_widget
      IPA.rights_widget
      IPA.target_section (it's a widget)
    
    Solution:
     * added call to checkbox, checkboxes, radio, select, table, attributes widget
     * rights_widget inherits it from checkboxes_widget.
     * target_section IS NOT a widget as it doesn't inherit from widget. It's still a section, which shows different widgets based on its state.
     * table_widget displays error_link between pagination and summary.
    
    Additional:
     * added padding and unified font-weight for error message