groupId isn't set while adding file to workspace.

[VolkerHartmann]

ocrd workspace add --file-grp OCR-D-TEST --file-id test_file1 --group-id image0001 --mimetype image/tiff anyImage.tif

Will not check for duplicated entries (same ID) and won't create a groupID.

if file is the original image (USE=OCR-D-IMG) GROUPID and ID has to be identical!
There should be at least a test if a file with ID=GROUPID in fileGrp "OCR-D-IMG" exists