COMP: GCC_XML external project does not use BUILD_EXAMPLES

The patch addressed the following warning when using using WrapITK and
building GCC_XML as an external project:

CMake Warning:
  Manually-specified variables were not used by the project:

    BUILD_EXAMPLES

Change-Id: Ia5af163f998c8fde72b5ca93d2d03d4b43878681
Merge topic 'GccXMLNoExamples'

8808cb3 COMP: GCC_XML external project does not use BUILD_EXAMPLES
BUG: Dicom method for Dir Cosines made non-orthogonal directions

In response to this bug report:
https://itk.icts.uiowa.edu/jira/browse/ITK-3004

The 'slice direction' vector for DICOM slices is derived by taking
the cross product of the row and column direction vectors, which
are in the Image Orientation Patient tag (0020,0037). This
is standard procedure for DICOM image volumes.

Some DICOM files will have values in this tag that end up
generating a non-orthogonal set of direction cosine vectors.

This commit adds code to orthogonalize the vectors before setting
them in the ImageIOBase, and adds a test to verify that this is
working properly.

Change-Id: I3d7979867bc9383abfb2427ffb2428220ac2ee33
Merge topic 'OrthogonalizeDICOMDirections'

ca8dedd BUG: Dicom method for Dir Cosines made non-orthogonal directions
COMP: Install openjpgDllConfig.h

Addresses bug report:
https://itk.icts.uiowa.edu/jira/browse/ITK-3025

openjpeg.h includes openjpegDllConfig.h, but it wasn't
being installed.

Change-Id: Ic965f70cb9a1ade50d5e3e252bac295c9a1ad373
Merge topic 'itkOpenJPEG_install_headers'

1e45327 COMP: Install openjpgDllConfig.h