capture doctype in tagged records

[ehenneken]

Capture the doctype value from the Ingest Parser output in the tagged records as (per @csgrant00)

%I DOCTYPE:dataset

Required changes in the _get_properties function in the translator.py module:

1. Add: doctype = self.data.get('doctype', None)
2. Add:

        if doctype:
            props['DOCTYPE'] = doctype

To properly capture dataset doctype for DataCite records, the value for Dataset needs to be changed from misc to dataset here

This update is to support the ingest of Zenodo records and be able to attribute the appropriate publication type.