ENENTY ( entity, ltypes, types, ntypes, ifail )
===============================================

  Enquire entity type

    Can be called from the GO.

Receives:
 <KI_tag_entity>           *entity         --- entity
  KI_int_nitems            *ltypes         --- maximum length of types array

Returns:
  KI_cod_ty                 types[ltypes]  --- type-codes of entity
  KI_int_nitems            *ntypes         --- number of type-codes returned
  KI_cod_error             *ifail          --- failure indicator

Specific errors:
  KI_buffer_overflow        More than 'ltypes' type-codes to return

Description:
  The entity with the given tag is found and a list of type-codes is returned
  which together define the type of the entity.

  The first code will be from the range TYEN00 and will indicate whether the
  entity is topological, geometric, or associated data. The following
  type-codes will be drawn from various other ranges, determined hierarchically
  (for example a geometric entity may yield a list of type values 'geometric',
  'curve', 'elliptic': TYENGE, TYGECU, TYCUEL).

  If a null tag is given TYEN00 is returned.