DLENFE ( featre, entity, ifail )
================================

  Delete entity from feature

Receives:
  KI_tag_feature           *featre         --- feature
  KI_tag_entity            *entity         --- entity to be removed

Returns:
  KI_cod_error             *ifail          --- failure code

Specific errors:
  KI_not_in_feat            entity not found in feature
  KI_wrong_type_for_feat    'entity' does not match feature type

Description:
  Removes the entity from the feature.