DEIMS: The metadata-provider, publisher and contact roles

We assign the "metadata provider, publisher and contact roles" to McMurdo LTER. This node has different nids in different systems, and this is hard coded in the migration. watch it!

Also, in the EML migration, this could also map the one-to-many by virtue of NOT modifying the DOM-XML object inside the $row->xml object, but the $row->element itself, just like we do for dataTableRef.