Update the vtkDICOM remote module to v0.7.8.
Changes since 0.7.7:
- Sort by InstanceNumber even if DICOMDIR is present
- Use utf-8 to store data in vtkMedicalImageProperties
Bug fixes since 0.7.7:
- Fix possible crash for incorrect iso-2022-kr text
- Fix Win32 unicode handling in dicomfind -exec
- Fix NumberOfFrames query for dicomtocsv