New service operation to retrieve results

[DenisKnoepfle]

After a successful diagnosis run the results should be retrievable via DS service. Here only the main results should be retrieved. But additionally it should be possible to fetch the raw data (offered as a download option in the UI later) if required.

[DenisKnoepfle]

Implemented request operation for main results in 23318e3.

[DenisKnoepfle]

Implemented automatic fetching of results in 72c07c1.

[DenisKnoepfle]

Now all resources are fetched as well except for raw data (the csv folder).