Use case: Manually alter FITS mappings

[magnusmanske]

The key mappings that need to be captured are:

• File-to-sample
• Sample-to-taxon
• Sample-to-alfresco_study_code
  The changes will need to be done in such a way that data can be overwritten or removed by later updates from mlwh/iRODS or elsewhere.

[podpearson]

@magnusmanske so that other people can understand why this is important could you write a brief description of why this needs doing, i.e. what underlying problem this resolves?

[podpearson]

Also, do you think this should be in scope for MVP v1?