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1.4.0 2019/10/22 ABI 8:0:0
   * Ongoing work to support polarization:
      * Support parallel transport of local tetrad
        + in many methods, double* coord_ph becomes state_t &coord_ph
	+ Worldline: new APIs parallelTransport(), eAllocate(),
	  eDeallocate(), eExpand()
	+ Scenery: new API parallelTransport()
	+ Screen: new API getRayTriad()
      * Introduce polarized quantities (Inu and alphanu for each
        component of the Stokes vector)
        + Several methods take additional arguments
	+ Photon: new method transfer()
	+ Scenery: new API getSpectralQuantitiesCount()
   * Support computing Screen tetrad from arbitrary velocity
      * Metric:
      	+ new API zamoVelocity(), default assumes null 3-velocity.
   	+ new API observerTetrad(in pos, in fourvel, out screen1,2,3),
     	  default throws an Error.
   	+ new methods to help vector computations: dualOneForm(),
   	  normalizeFourVel(), norm(), multiplyFourVect(),
   	  addFourVect(), projectFourVect(), GramSchmidt()
      * KerrBL:
	+ implement zamoVelocity();
   	+ remove observerTetrad(obskind...);
   	+ implement observerTetrad(pos, fourvel, ...) for any fourvel.
      * Screen: supports two new obskinds: VelocitySpecified and
        FullySpecified. obskind is now stored as and int and needs to
	be specified as e.g. <ObserverKind>ZAMO</ObserverKind> in XML.
   * Astrobj:
      * Generic: new property DeltaMaxInsideRMax
      * New kinds FlaredDiskSynchrotron, ThickDisk
      * Jet:
        + support thermal distribution
	+ new property JetVphiOverVr
      * ThinDisk: new property VelocityKind
      * Torus: add a Thermal Synchrotron spectrum
      * UniformSphere: deprecate property Alpha
   * Screen:
     * support changing camera orientation (with dangle1 and dangle2)
     * change type of observerkind_ to obskind_t
   * Python: new module gyoto.animate to help writing Gyoto-based movies.
   * Command line: new task mk_video to help writing Gyoto-based movies.
   * Register: loadPlugin() now returns a handle o the dlopen'ed plug-in.
   * Star/StarTrace: allow expressing dates in proper or coordinate time.