BUG: ImageSeriesWriter + GDCMImageIO loses info

When directional cosines are copied from 3D volume to 2D slices by
ImageSeriesWriter, only the upper-left 2x2 matrix can be copied, due to the
dimension of m_Direction matrix.

Then GDCMImageIO sets zeros in the missing values of the first 2 lines of the
matrix.

This is not a problem if the directional cosines matrix is the identity matrix,
otherwise DICOM tag (0020,0037) Image Orientation (Patient) of the output
DICOM files is not valid.

ITK-281

Change-Id: I44bac496fb1132abb85a5f9d66bd7ad469c774b2
Merge topic 'ITK-281'

df66144 BUG: ImageSeriesWriter + GDCMImageIO loses info