Automatically connect to Dataverse when updating the Settings

[helkv]

If the Upverse Settings (API Token & Repository URL) are saved, the user is NOT automatically connected to Dataverse.
Clicking the the Test-Button in the Settings menu or the Reload-Button in the Main menu connects the User to the Dataverse instance configured in the Settings.

Enhancement:

• Automatically connect to Dataverse when the Settings are saved.
• If the Settings are saved, the connection status (List of Datasets & Username) should be updated, so there is no inconsistency between the Settings and the displayed connection status. In case of a failed connection the status should be set to a "not connected" status.