{
{    This interface is used to change an existing field in a template file.
{
{       AVP$CHANGE_FIELD (FIELD_NAME, DESCRIPTION_RECORD_NAME,
{             TYPE_SPECIFICATION, DEFAULT_VALUE, DESCRIPTIVE_TEXT,
{              UTILITY_INFORMATION, FILE_INFORMATION, STATUS);
{
{ FIELD_NAME: (input) Name of the field to be changed.
{
{ DESCRIPTION_RECORD_NAME: (input) Name of the description record containing
{       field to be changed.
{
{ TYPE_SPECIFICATION: (input) Type specification for the field.
{
{ DEFAULT_VALUE: (input) Default value for the field.
{
{ DESCRIPTIVE_TEXT: (input) Descriptive text for the field.
{
{ UTILITY_INFORMATION: (input) Pointer to utility information for the field.
{
{ FILE_INFORMATION: (input, output) Record used by the template file manager to
{       hold information about the template file.
{
{ STATUS: (output) Variable in which the completion status is returned.
{       CONDITIONS:
{              ave$conflicting_lock
{              ave$file_full
{              ave$record_too_large
{              ave$unknown_description_record
{              ave$unknown_field
{
