dicom_archive/dicomTar.pl and dicom_archive/updateMri_upload.pl

[cmadjar]

• [x] run dicomTar.pl without the -database flag and ensure nothing gets inserted into the DB
• [x] run dicomTar.pl with the -database flag and check that entries got inserted into the DB in the tarchive* tables correctly
• [x] run dicomTar.pl with the -mri_upload_update flag on a DICOM directory that was not previously uploaded via the imaging uploader (ensure there is nothing in mri_upload table for that study before running the script) => ensure that an entry has been added to mri_upload for the uploaded DICOM study