CSV import, de-duplicate (or not)

[PaulPoulain]

The import tool added to resources module is a nice tool. It has a caveat though: sometimes, you want to insert a file that contains a resource that already exist, but is provided by another provider. In this case, you don't want only one resource, you want to have it twice. Sometimes, though, you want to test & de-duplicate, in order to update an existing resource.
The proposed change would be to add a radiobox in the CSV import screen, to let the librarian decide to :

• NOT try to find any duplicate (ie: importing the same CSV twice will result in resources being created twice)
• try to find duplicate, based on (e)ISSN
• try to find duplicate, based on (e)ISSN AND parent resource name.