SRCHTG ( list, value, start, index, ifail )
===========================================

  Search for a value in a list of tags from a starting index.

    Can be called from the GO.

Receives:
  KI_tag_list_tag          *list           --- list which is to be searched
  KI_tag                   *value          --- entity to be looked for
  KI_int_index             *start          --- starting position to look for tag

Returns:
 <KI_int_index>            *index          --- index of item in list which
                                           --- matches given value
  KI_cod_error             *ifail          --- failure indicator

Specific errors:
  KI_bad_index              'start' not less than list length + 1

Description:
  The list is searched from a starting position for a match with the given tag.
  The starting index cannot be less than 1, the start of the list, or greater
  than the list length. If no match is found 'index' is set to zero.