FNENFE ( featre, entity, found, ifail )
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  Find entity in feature

    Can be called from the GO.

Receives:
  KI_tag_feature           *featre         --- feature
  KI_tag_entity            *entity         --- entity to be looked for

Returns:
  KI_cod_logical           *found          --- true if entity is in feature
  KI_cod_error             *ifail          --- failure code

Specific errors:
  KI_wrong_type_for_feat    'entity' does not match feature type

Description:
  Returns true if the entity is in the feature, false otherwise.