Import EML from DataONE Package Imports

[ThomasThelen]

Right now we're not bringing in the package's EML document, or more generally the science metadata. This will be a desired feature when the Brown Dog and C2Metada pipeline is set up so that the SDTL can be inserted into the EML document before publishing.

Right now when we publish to DataONE, we're creating our own EML record.

1. Check if there's an EML document in the registered datasets
2. If so, use it as the primary EML document
3. If not, then continue to generate the EML document in gwvolman and use it as the primary EML