In this commit, we provide a complete revision and extension of support for
hypertreegrid objects and filters, hereby entirely superseding the first
versions thereof which we developed in 2011-2012.
When compared to those obtained by constructing an intermediate
unstructured mesh with fully described connectivity, this new structure
demonstrates a gain of at least 80% in terms of memory footprint,
with a better rendering while retaining similar execution speed.

All ancillary structures such as cursors and supercursors have also
been entirely refactored, for the sake of performance as well as of
ease of maintenance. Existing native filters, i.e., that operate
directly on hypertreegrid objects, have been revised accordingly.
In addition, several new native filters have been added, together with
a large set of non-regression tests and baseline images.

This commit also implements an adaptive approach in order to accelerate the
rendering of 2-dimensional hypertreegrids, hereby solving the problem posed
by the loss of interactivity that occurs when dealing with large and/or
deeply refined meshes. Specifically, view parameters are taken into account,
in order to: on one hand, avoid creating surface elements that are
outside of  the view area; on the other hand, utilize level-of-detail
properties to cull those cells that are deemed too small to be visible
with respect to the given view parameters. This adaptive approach typically
results in a massive increase in rendering performance.

Please refer to the following articles for a comprehensive description:
https://arxiv.org/abs/1702.04852
https://arxiv.org/abs/1703.00212

e230d658

 missed two calls of UnBind for LIC

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3118

LIC was calling UnBind

792f5a3d

 vtkDataEncoder: fix 'ENCODING_NONE' option so it works.

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Sebastien Jourdain <sebastien.jourdain@kitware.com>
Acked-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !3117

88c5198b

 remove extra calls that did nothing and fix some leaks

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Allison Vacanti <allison.vacanti@kitware.com>
Merge-request: !3108

Returning a binary image to Python requires keeping the vtkArray
then copying to a 'byte' type in python.

04e08d48

 Adding in edge uses cases for vtkLine::DistanceToLine() method.

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Utkarsh Ayachit <utkarsh.ayachit@kitware.com>
Merge-request: !3109

now that we do not unbind some extra calls were
left behind.

A couple classes were leaving textures active when they
should have been deactivated. Fix them.

Giving better results, even for situations where there is bad
numerical accuracy and also fixing uninitialized value compiler
warning in the method.

d1b93ae0

 Change return type of GetOperandNumber to avoid overflow

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Cory Quammen <cory.quammen@kitware.com>
Merge-request: !3107

27cf958f

 rearchitect the 3D interaction code

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3096

056dd9a3

 Fix picking when using QVTKOpenGLWidget

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Sankhesh Jhaveri <sankhesh.jhaveri@kitware.com>
Merge-request: !3103

ce5951d7

 Remove a bogus check in vtkSphereTree

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Nicolas Vuaille <nicolas.vuaille@kitware.com>
Merge-request: !3092

If a vtkArrayCalcualtor had more than 256 arrays registered, it would
overflow the return type of GetOperandNumber.  This would lead to using
the wrong variable name length when parsing the rest of the function.

dfab6587 Fix template resolution issues with data array baseclasses.
32a5dc14 Fix incorrect (vtkIdType / int).
072d7593 Add missing call to unit test function.
02c58376

 Remove unused helper template .

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Ken Martin <ken.martin@kitware.com>
Merge-request: !3105

* webserver_update:
  AutobahnPython 2017-07-25 (d2cf256f)
  txaio 2017-08-03 (3329fd90)
  Twisted 2017-07-25 (1ff01541)
  hyperlink 2017-08-03 (166d307a)
  wslink 2017-07-25 (1d70dfac)
  ZopeInterface 2017-07-25 (f4530aaf)
  incremental 2017-07-25 (326b1b5f)
  AutobahnPython: prep for ThirdParty import and getting latest version
  ThirdParty docs: add detail to update steps, fix imported.md
  Thirdparty: Setup to import txaio and hyperlink.

Merge-request: !3097

8b1fe143

 Fix a few unitialized vars warnings.

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Cory Quammen <cory.quammen@kitware.com>
Merge-request: !3106

ee282734

 mark copy constructor private etc on vtkTImerLogScope

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Cory Quammen <cory.quammen@kitware.com>
Merge-request: !3101

Picking both 2D and 3D actors could fail when using QVTKOpenGLWidget.
This commit fixes picking by ensuring that the framebuffer object that
VTK renders into is bound at the start picking operations.

Template resolution prefers a generic template specialization over
a base class. For instance, if there are two operator() overloads in
a dispatch worker like this:

template <typename ArrayT> void operator()(ArrayT *array) {...}
template <typename ValueT> void operator()(vtkAOSDataArrayTemplate<ValueT> *array) {...}

and we call the worker with e.g. vtkCharArray as the argument type,
the first (generic) overload is selected, even though vtkCharArray is a
vtkAOSDataArrayTemplate<char>. This is because ArrayT is a better match
for vtkCharArray than vtkAOSDataArrayTemplate<char> according to the
c++ template resolution rules.

The solution is to not provide a completely generic overload. Instead,
use vtkGenericDataArray<D, V> or vtkDataArray (or both, depending on
usecase) for the generic case, as this way the template resolution MUST
inspect the heirarchy to find an suitable overload, and will find the
more derived specializations first.

I've verified that the intended/most-performant overloads in these
situations will be used on GCC 7.1.1.

* upstream-AutobahnPython:
  AutobahnPython 2017-07-25 (d2cf256f)

Code extracted from:

    https://gitlab.kitware.com/third-party/autobahn-python.git

at commit d2cf256f3a947426668ec17551f22826e43a4d57 (for/vtk).

* upstream-txaio:
  txaio 2017-08-03 (3329fd90)

Code extracted from:

    https://gitlab.kitware.com/third-party/txaio.git

at commit 3329fd903947c043655cc8ac4c1bb004961e55cc (for/vtk).

* upstream-Twisted:
  Twisted 2017-07-25 (1ff01541)

Code extracted from:

    https://gitlab.kitware.com/third-party/twisted.git

at commit 1ff01541b859b26ab850edeb1395cabaca5caf46 (for/vtk).

* upstream-hyperlink:
  hyperlink 2017-08-03 (166d307a)

Code extracted from:

    https://gitlab.kitware.com/third-party/hyperlink.git

at commit 166d307ac3f052d5e71e3cfd8b1cab7f0b492fca (for/vtk).

* upstream-wslink:
  wslink 2017-07-25 (1d70dfac)

Code extracted from:

    https://github.com/Kitware/wslink.git

at commit 1d70dfac217087632a51dd86f8ee9b1674487121 (master).

* upstream-ZopeInterface:
  ZopeInterface 2017-07-25 (f4530aaf)

Code extracted from:

    https://gitlab.kitware.com/third-party/zope.git

at commit f4530aaf9c00298334cd3de314a15261561da8b2 (for/vtk).

* upstream-incremental:
  incremental 2017-07-25 (326b1b5f)

Code extracted from:

    https://gitlab.kitware.com/third-party/incremental.git

at commit 326b1b5f4e5611249644f43ec8db55b9a38227d7 (for/vtk).

Remove the old library and add update.sh to import from
third-party/autobahn-python.git

New Twisted: fix import script for renamed News.rst file.
Add 'hyperlink' dependency for new version