TAC downloads should include 'project name' in filenames

[AllanEngland]

A request from the eMerlin TAG is that downloaded pdf's etc retain the project title in their filename. I have reduced these to compiledJustifications.pdf and overview.html for simplicity (and reuse of functions for generic export) but now need to reinstate unique filenames.

[AllanEngland]

Admin and reviewer downloads now feature part of the project name as the filename for json, compiled justifications pdf and the overview html documents.

Proposal exports by an investigator retain the standard fixed filenames so they can still be used for import.