COMP: Handle missing Analyze 7.5 flipped directions

We have a customer with an Analyze file that was
falling into the 'default' case and warning
"Unknown orientation in file".  Fixed by adding
the missing cases, specifically:
itk::AnalyzeImageIO::ITK_ANALYZE_ORIENTATION_RAI_TRANSVERSE_FLIPPED
itk::AnalyzeImageIO::ITK_ANALYZE_ORIENTATION_PIL_SAGITTAL_FLIPPED
itk::AnalyzeImageIO::ITK_ANALYZE_ORIENTATION_RSP_CORONAL_FLIPPED

Fixed by my colleague Mathieu Coursolle.

Change-Id: I19735caf99433114152714af7bfe1dd85edaab2f
Merge branch 'Analyze7.5' into release-3.20

Change-Id: Ia6fc148234017a82f81e1f65f77d23ba4675a0e7