COMP: Change default version of VTK to 6

As discussed during June 17 developer hangout and also highlighted on the
Slicer developer list [1], consider that a lot of developer have been
reporting issue and we now have the Slicer application able to build and
run when build against VTK6. This commit changes the default version of VTK.

It is anticipated that some extension will fail to build, error will be
addressed as they come. Additional help will also be provided for
extension developers during the coming project week. See [2]

[1] http://slicer-devel.65872.n3.nabble.com/VTK-6-enabled-by-default-tt4031841.htm

[2] http://www.na-mic.org/Wiki/index.php/2014_Summer_Project_Week

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23336 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Update ExecutionModelTourTest input scene to include MRML version

This commit updates the test input data to account for commit r23331
including MRML version in the mrml file.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23337 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Update VTK project to fix build using Xcode 5.1.1

This commit updates the Slicer VTK project to include the following
patch cherry-picked from current VTK development branch.

Thanks to Hans Johnson for suggesting the backport.

8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----
Author: Sean McBride <sean@rogue-research.com>
Date:   Thu Feb 13 14:26:42 2014 -0500

    Removed -fobjc-gc from VTK_REQUIRED_OBJCXX_FLAGS

    There are 3 memory management models in Cocoa,
    chronologically by introduction: MRR, GC, ARC.
    VTK supports the first two.
    GC is now deprecated however, and Xcode 5.1 will
    no longer even build GC code.  Therefore
    removed the -fobjc-gc option as a default.
    (It built the libraries as both MRR and GC
    compatible, which was convienent for library code.)
8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23338 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Update VTK project to fix CMake 3.0 configuration warnings

This commits updates Slicer VTK fork to include two commits backported
from VTK master. See commit kitware/VTK@7df9a25f and kitware/VTK@d19b4db8

$ git shortlog baa177b..4d7abb2
Brad King (2):
      COMP: Drop invalid custom commands from HDF5
      COMP: Drop missing dependencies of target 'vtkpython_pyc'

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23339 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Update SlicerExecutionModel

This commit both (1) fixes CMake 3.0 config warnings (see below) and
(2) updates the project to include fixes and improvements contributed by
the community:

//------------------------------
$ git shortlog 46f3d89..865e2a7 --no-merges
Jean-Christophe Fillion-Robin (4):
      ENH: Set default value for CMAKE_BUILD_TYPE
      ENH: Add support for CMake 3.0 removing use of LOCATION target property
      ENH: Re-factor GenerateCLP tests to support multi config system
      COMP: By default, disable JsonCpp support.

Jim Miller (2):
      Update README.md
      Update README.md

Julien Finet (1):
      Don't search default path when JsonCpp_DIR is provided

Matt McCormick (3):
      BUG: Output vector argument should not be assigned.
      BUG: Serialize a geometry Parameter with aggregate="true", multiple="true".
      BUG: Fix serialization/deserialization with not Multiple but vector.

Matthew Woehlke (2):
      ENH: Refactor [de]serialize format for brevity
      STYLE: Avoid file(GLOB)

ivmartel (1):
      Allow for reference attribute for geometries.
//------------------------------



This commit fixes the following warning:

//--------------------
CMake Warning (dev) at GenerateCLP/GenerateGenerateCLPConfig.cmake:7 (get_target_property):
  Policy CMP0026 is not set: Disallow use of the LOCATION target property.
  Run "cmake --help-policy CMP0026" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.

  The LOCATION property should not be read from target "GenerateCLPLauncher".
  Use the target name directly with add_custom_command, or use the generator
  expression $<TARGET_FILE>, as appropriate.

Call Stack (most recent call first):
  GenerateCLP/CMakeLists.txt:201 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.
//--------------------

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23340 3bd1e089-480b-0410-8dfb-8563597acbee