title types from datacite records #188

This PR extends the mapping applied to datacite records towards the graph internal model. It considers the title type attribute:

when present it is mapped as it is;
when missing, the title is considered to be the main title

  <titles>
    <title xml:lang="en-US">Full DataCite XML Example</title>
    <title xml:lang="en-US" titleType="Subtitle">Demonstration of DataCite Properties.</title>
  </titles>

Example from https://support.datacite.org/docs/schema-metadata-examples-v41

This PR extends the mapping applied to datacite records towards the graph internal model. It considers the title type attribute: - when present it is mapped as it is; - when missing, the title is considered to be the main title ``` <titles> <title xml:lang="en-US">Full DataCite XML Example</title> <title xml:lang="en-US" titleType="Subtitle">Demonstration of DataCite Properties.</title> </titles> ``` Example from https://support.datacite.org/docs/schema-metadata-examples-v41

The code seems ok! I proceed to merge the pull request.

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title types from datacite records #188

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