ENH: adding metadata roundtrip test for SEG
ENH: adding metadata roundtrip test for SEG

The test is failing at the moment, because of the identified inconsistencies,
this will need to be fixed. Addresses #97.

QIICR/dcmqi,QIICR/dcmqi,QIICR/dcmqi,QIICR/dcmqi,QIICR/dcmqi