Microsecond precision on SIP status timestamp
Microsecond precision on SIP status timestamp

Now when ingest/status is called by jobs.js, the dashboard returns
microsecond precision on the unix timestamps for SIP last modified. This
fixes a bug where the representation of a SIP will not update in the GUI if its
final jobs all completed at the same second.

artefactual/archivematica,artefactual/archivematica,artefactual/archivematica,artefactual/archivematica