DELSEN ( gm, ifail )
====================

  Delete single geometric entity

Receives:
  KI_tag_geometry          *gm             --- geometry to delete

Returns:
  KI_cod_error             *ifail          --- failure code

Specific errors:
  KI_still_referenced       argument is still referenced
  KI_is_attached            geometry is attached to topology

Description:

  Deletes a single geometric entity.

  A geometric entity is deleted, without deleting any of its dependents.
  For example, deleting a trimmed curve will leave the underlying curve intact.

  A geometric entity cannot be deleted if it is a dependent in another
  geometric entity or if it is attached to topology.