* Add 2.0.0 changelog
* Update DMSInterface and DMSDocumentInterface removing *page and adding getDocumentSetsByPage to DMSInterface
* Update use documentation and update unit tests
This commit changes the relationship from Pages has_many Documents to Pages has_many DocumentSets which are many_many to Documents. The upload field has been upated to attach documents to a set instead of a page, the tests updated and the DMSInterface and DMSDocumentInterface updated to be less relevant to pages and more relevant to document sets.
This fix is quite ugly, but in theory, it's fine. By ugly,
I mean the interface is kind of weird without it.
Because 3.1 allows uploading when a DataObject doesn't exist,
we need to override the new defaults to not allow such if
the DO isn't saved yet.
Instead of relying on JavaScript requirements blocking,
configure a more specific template name to use
in certain situations. We can't control JS files
loaded by the browser already by previous requests,
so Requirements blocking does not override the
template in all cases, creating execution-path specific
edge cases (like showing "save to refresh" messages
in the background of a "add document" upload success)
