Updated ParallelConnectivity to exercise the new mode in parallel and
serial.

By default, the mode is UNSPECIFIED, which matches the previous
behavior of how RegionIds are assigned to different connected
components.

Another option, CELL_COUNT_DESCENDING, has also been implemented. In
this mode, RegionIds are assigned to connected components such that
the lowest RegionId is assigned to the component with the largest
number of cells and other RegionIds are assigned in descending order
of cell count.

vtkPConnectivityFilter will be instantiated when a
vtkConnectivityFilter::New() when MPI is
enabled. vtkConnectivityFilter functions will still be called when the
program is run serially rather than with mpiexec with -np > 2.

This changes the vtkConnectivityFilter so that it produces a
vtkPolyData when the input is a vtkPolyData and a vtkUnstructuredGrid
when the input is anything else. It used to produce only
vtkUnstructuredGrid outputs.

This topic is the result of running clang-tidy to
modernize our usage of NULL and 0 to nullptr. It also
includes some manual and semi manual changes where
clang-tidy would not be expected to work (such as in
comments, or classes not compiled on this build)

There are definitely many comments and occurances that
this topic misses that we will need to fix over time.

Found and auto-fixed by clang-tidy’s readability-redundant-control-flow check.

Though I did have to manualy fix whitespace after it.

This commit reindents the code with the following utility:
Utilities/Maintenance/vtk-reindent-code.py

This utility changes the positions of the braces so that they are no
longer indented relative to the code block they reside in.

The bash command line used was the following:

for d in Charts Common Deprecated Domains Examples Filters GUISupport \
         Geovis IO Imaging Infovis Interaction Parallel Rendering \
         Testing Views Web Wrapping; do
  for e in cxx cxx.in txx txx.in hxx hxx.in h h.in c c.in; do
    find "${d}" -name "*.${e}" -exec \
      python Utilities/Maintenance/vtk_reindent_code.py {} +
  done
done

Proj Upstream authored Mar 08, 2016 and Lipsa, Dan committed Mar 08, 2016

Code extracted from:

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

at commit 41bdf05361007f8c5186f3df9944d86bb273ed13 (for/vtk).

When desired output precision is DEFAULT_PRECISION and the input
is empty, this prevents GetDataType() from being called on a
NULL vtkPoints instance.

Change-Id: I10e1fd8db008c015f1c96ece33007e35273329c4

This updates a second batch of core filters to support a choice of
desired precision (default, single, or double) for output points. It
uses the analogous code in vtkThreshold as a model.

Change-Id: I404c1bf2ea624e9065768297a1ec5247d1751647

Exclude ThirdParty, Utilities/MetaIO, and Utilities/KWSys as these
are maintained outside VTK.

Co-Author: Marcus D. Hanwell <marcus.hanwell@kitware.com>
Co-Author: Chris Harris <chris.harris@kitware.com>
Co-Author: Brad King <brad.king@kitware.com>

Move source files from their former monolithic VTK location to their new
location in modular VTK without modification.  This preserves enough
information for "git blame -M" and "git log --follow" to connect
modularized VTK files to their original location and history.

Co-Author: Marcus D. Hanwell <marcus.hanwell@kitware.com>
Co-Author: Chris Harris <chris.harris@kitware.com>
Co-Author: Brad King <brad.king@kitware.com>
Co-Author: Nikhil Shetty <nikhil.shetty@kitware.com>

The CVS $Revision$ keyword replacement will no longer maintain these
macros automatically.  They were used only to implement CollectRevisions
and vtkObjectBase::PrintRevisions, an API that was never used.

Automated as follows:

  pass 0:
  catch templates
  ---------------
  $ git grep 'vtk\(Cxx\|Type\)RevisionMacro' | grep '<'

  pass 1:
  main changes
  ---------------
  $ git grep -l '^vtkCxxRevisionMacro' | while read file; do
    echo "$file" 1>&2
    perl -i -ne 'print unless (/^vtkCxxRevisionMacro/ and /\)/)' $file
  done
  $ git grep -l -e 'vtkTypeRevisionMacro(' | while read file; do
    echo "$file" 1>&2
    perl -i -pe 's/vtkTypeRevisionMacro/vtkTypeMacro/g' $file
  done

  pass 2:
  verify
  ---------------
  $ git grep 'vtk\(Cxx\|Type\)RevisionMacro'

Fixed multi-line vtkCxxRevisionMacro and templates by hand.

The CVS $Revision$ keyword replacement will no longer maintain these
macros automatically.  They were used only to implement CollectRevisions
and vtkObjectBase::PrintRevisions, an API that was never used.

Automated as follows:

  pass 0:
  catch templates
  ---------------
  $ git grep 'vtk\(Cxx\|Type\)RevisionMacro' | grep '<'

  pass 1:
  main changes
  ---------------
  $ git grep -l '^vtkCxxRevisionMacro' | while read file; do
    echo "$file" 1>&2
    perl -i -ne 'print unless (/^vtkCxxRevisionMacro/ and /\)/)' $file
  done
  $ git grep -l -e 'vtkTypeRevisionMacro(' | while read file; do
    echo "$file" 1>&2
    perl -i -pe 's/vtkTypeRevisionMacro/vtkTypeMacro/g' $file
  done

  pass 2:
  verify
  ---------------
  $ git grep 'vtk\(Cxx\|Type\)RevisionMacro'

Fixed multi-line vtkCxxRevisionMacro and templates by hand.

with the regions ids. It was using FloatArray earlier.

use AddArray and SetActiveScalars or SetActiveAttribute instead of SetScalars when new scalars are created

BUG: type outScalar->outScalars

1.) vtkTypeRevisionMacro is now used in all VTK classes in place of
    vtkTypeMacro.  It invokes the original vtkTypeMacro and then adds
    a protected CollectRevisions method for future use in serialization.
    A corresponding vtkCxxRevisionMacro has been added to every .cxx file
    to implement the CollectRevisions method for each class.  This will
    allow collection of every class revision at run time.  Any new VTK class
    should use vtkTypeRevisionMacro instead of vtkTypeMacro.  The .cxx
    implementation should then have the following line:
      vtkCxxRevisionMacro(vtkFoo, "$Revision: 1.1 $");
    CVS should insert the correct revision number when the class is commited.

2.) vtkTypeMacro now also adds a typedef called "Superclass" to refer to
    the superclass of any VTK class.  All PrintSelf methods have been
    updated to call their superclass's PrintSelf like this:
      this->Superclass::PrintSelf(os,indent);
    This should reduce the number of places that refer to a superclass
    by its actual name.

3.) The standard ::New() method implementation has been replaced with a
    macro.  Instead of an explicitly written implementation to try the
    object factory and then call the new operator, VTK classes should
    instead use the following macro unless they have a special New() method:
      vtkStandardNewMacro(vtkFoo);
    This will implement the New() method in the standard way.  The line
    should appear in the .cxx implementation file, not in the header.
    Using the macro will make it easier to change the standard
    implementation of the method.

Also removed tabs from many files.

A new CVS repository was created on 2001-04-26 to fork VTK during
transition to a new source tree layout.  The new repository was created
using server-side symlinks referencing files in the original repository
to preserve per-file history.  This commit was manufactured during
conversion from CVS to represent the fork as a branch.