BUG: Disable ITK_AUTOLOAD_PATH/itkMRMLIDIOPlugin for executable CLIs

Follow up of commit r21440, unset environment variable ITK_AUTOLOAD_PATH
consistently:

Unset ITK_AUTOLOAD_PATH environment variable to prevent the CLI from
loading the itkMRMLIDIOPlugin plugin because executable CLIs read images
from file and not from shared memory. Worst the plugin in the CLI
could clash by loading libraries (ITK, VTK, MRML) other than the
statically linked to the executable.
Historically, there was an nvidia driver bug that causes the module
to fail on exit with undefined symbol.


// ------------------
This fixes the following error (Ubuntu 10.04 / gcc 4.4.3):

Error(s):
    CLI executable: /home/jchris/Projects/Slicer-AHM-Superbuild-Debug/Slicer-build/lib/Slicer-4.2/cli-modules/AddScalarVolumes
    /home/jchris/Projects/Slicer-AHM-Superbuild-Debug/Slicer-build/lib/Slicer-4.2/cli-modules/AddScalarVolumes: symbol lookup error: /home/jchris/Projects/QtSDK-1.2/Desktop/Qt/474/gcc/lib/libQtGui.so.4: undefined symbol: _ZN11QMetaObject11removeGuardEPP7QObject

    CLI executable: /home/jchris/Projects/Slicer-AHM-Superbuild-Debug/Slicer-build/lib/Slicer-4.2/cli-modules/AddScalarVolumes
    Failed to retrieve Xml Description

// ------------------
.. and also the following warnings (MacOSX 10.8.3 / Gcc 4.2.1):

Error(s):
    CLI executable: /Volumes/Dashboards/Experimental/Slicer-1-Superbuild-Release-cmake-2.8.11-rc1/Slicer-build/lib/Slicer-4.2/cli-modules/ProbeVolumeWithModel
    WARNING: In /Volumes/Dashboards/Experimental/Slicer-1-Superbuild-Release-cmake-2.8.11-rc1/ITKv4/Modules/Core/Common/src/itkObjectFactoryBase.cxx, line 514
/Volumes/Dashboards/Experimental/Slicer-1-Superbuild-Release-cmake-2.8.11-rc1/Slicer-build/lib/Slicer-4.2/ITKFactories/libMGHIOPlugin.so is already loaded

WARNING: In /Volumes/Dashboards/Experimental/Slicer-1-Superbuild-Release-cmake-2.8.11-rc1/ITKv4/Modules/Core/Common/src/itkObjectFactoryBase.cxx, line 514
/Volumes/Dashboards/Experimental/Slicer-1-Superbuild-Release-cmake-2.8.11-rc1/Slicer-build/lib/Slicer-4.2/ITKFactories/libMRMLIDIOPlugin.so is already loaded


// ------------------
This fixes the problem without explaining completely the underlying cause, more
investigation is required to have a clear understanding of the problem.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21853 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Ensure DCMTK_DIR is set in SlicerConfig.cmake

Introduced in r20634, the SlicerConfig variable DCMTK_DIR has never been
set. This commit fix this by updating SlicerGenerateSlicerConfig.cmake
and setting variable DCMTK_DIR_CONFIG.

Extensions should now be able to use variables DCMTK_LIBRARIES
and DCMTK_INCLUDE_DIRS directly after doing: find_package(Slicer)

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21854 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Fix installation of DCMTK apps on windows

Following commit r21849, DCMTK is used from the build tree and it is required
to specify the intermediate directory. Since package are made only in Release,
the value is forced to Release.

Ideally, dcmtk apps and library should be installed using DCMTK install
system by setting CPACK_INSTALL_CMAKE_PROJECTS.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21855 3bd1e089-480b-0410-8dfb-8563597acbee