Xrt

- Minor bug fixes.

- Enable custom materials in xrtQook.

- Add hyperbolic (oes.HyperbolicMirrorParam) and hyperboloid
(oes.HyperboloidCapillaryMirror) mirrors with focusing test scripts
`test_param_mirror.py` and `test_hyperboloid_tube_mirror.py`.

- Add an example for applying a slope error map to a parametric mirror
`examples/withRaycing/13_Warping/ExampleOfSlopeErrorMapToParametricMirror.py`.

- Major rebuild of the documentation on
`Read the Docs <http://xrt.readthedocs.io>`_ due to changed software
requirements on readthedocs.io.

- Add in-plane rotation to :meth:`Crystal.get_amplitude_pytte()`.

- Major update of :ref:`Tests of Materials <tests_materials>`. Add
:ref:`Bent crystals: comparison tests for pyTTE backends <tests_pytte>`.

- Enable calculations of elastically deformed crystals on GPUs. Based on PyTTE code. Used both in ray tracing and
xrtBentXtal GUI -- a GUI for comparative GPU-based bent crystal calculations.

- Add predefined material classes in three categories: crystals, compounds and elemental. Several crystal classes also include
elastic constants needed to calculate bent crystal reflectivity.

- All OpenCL tasks can be run on a remote GPU server.

- Extend the examples of 1D- and 2D-bent crystal analyzers with elastically deformed crystal reflectivity.

- Add docs "sampling-strategies" on sampling strategies of syncrotron sources. Add an example
"Undulator radiation through rectangular aperture" that illustrates various sampling methods.

- Add user classes of optical elements to xrtQook.

- Add an example "Orbital Angular Momentum of helical undulator radiation".

- Use python properties in OEs, screens, apertures etc. to transparently set object attributes.

- Bug fixes.

See the version history at [RTFD](http://xrt.readthedocs.io/history.html#history)

Major update for the synchrotron sources module

A bug fix release.
See the version history at [RTFD](http://xrt.readthedocs.io/history.html#history)

See the version history at [RTFD](http://xrt.readthedocs.io/history.html#history)