*8992* Replace Dataverse files when updated in OJS

If a suppfile's deposited in Dataverse, then later a modified or different file is uploaded through OJS, the earlier data file is removed and the new file is deposited.  Prevents orphaned (i.e., not accessible from OJS) files on the Dataverse side and avoids filename collisions described in https://redmine.hmdc.harvard.edu/issues/3301.