Tests: Normalize

Archivematica should normalized certain ingested file formats into preservation-friendly formats.

General

Normalization is triggered automatically when the user approves "Appraise SIP" in the dashboard.
The original files are not deleted.
When normalized files have the same file extensions as the original, the original files are not overwritten.
If the SIP contains files for which there are no default normalization paths, processing of the SIP does not stop.