DICOM Segmentations do not display

[fedorov]

Together with @CPBridge, @DanielaSchacherer, @dclunie and @cgorman we have been struggling to understand why we are unable to visualize multi-resolution DICOM SEG encoded as either TILED_SPARSE or TILED_FULL in Slim+Google DICOM Store combination. The samples are available in tests S6 and S7 in the IDC test inventory (access to the document is limited to IDC team members, but these specific samples can be shared at request with anyone interested to investigate the issue).