Cleanup S3 storage bucket when Baltrad-algorithm properly working

[stijnvanhoey]

When the vol2bird algorithm is running properly, the following actions should be performed:

• Cleanup current S3 bucket file listing
• Bulk file transfer from the Dutch server to the S3 bucket
• Restart the daily transfer cron-job

These actions are provided by the AWS boto3 package or the custom-provided functions of the datamover Python module.

@plieper, when you give a green light, I'll make sure these actions are taken.

[stijnvanhoey]

meanwhile: daily job is running with new data. closing here, discussion on archiving old files, see #46