Document IDs not Tied to Title

[M-C-McGrath]

Currently, changing the title of a document or other field used in the ID on pre-publication archive may result in creation of a second document on the public instance. The document ID should either be passed to the public instance (and constant) or a based on a non-user-changeable (but unique) field.

[M-C-McGrath]

This would be fixed for uploaded documents as a side effect of changing IDs to hashes as per TransparencyToolkit/OCRServer#1

It wouldn't be fixed for manually added entities though, so work here should probably focus on that.

[M-C-McGrath]

This should be fixed for documents with 3f27169 and TransparencyToolkit/OCRServer@a7255d9

It still needs to be fixed for user-added entities.