Fixed Accept header for Measurement CSV downloader
Merge pull request #470 from MastodonC/feature/fix-csv-measurement-download-with-data

Fixed Accept header for Measurement CSV downloader
First draft of sensor_id.
Fix failing tests.
Update difference series calculations.
Fix failing tests.
Update rollups.
Update conversions and batch checks.
Update all remaining calculations.
Store sensor_id in datasets.
Update datasets API and UI to support sensor_id.
Update rollups API
Make dataset name editable.
Update uploads with sensor_id.
Update measurements API to support sensor_id.
Firther updates to measurements API
Update downloads.
Update downloads with full header.