Python (and possibly other) bindings could return a real string for database UUIDs

[James Aylett]

Document.get_uuid() in the python bindings returns as bytes, which is the correct representation for std::string in general. However we know that this will always be a UUID (serialised as ASCII I think). We could change .get_uuid() to return str. It would be backwards incompatible, but there may not be enough people actually using it for that to be a problem.

We could also turn this into a property, so it's accessed as .uuid. I can't remember it it's possible to have both .uuid giving the new behaviour and a (perhaps deprecated) .get_uuid() giving the old.

Or this may be completely unnecessary given it can be worked round in user code and I doubt anyone else has even thought about this from a bindings consumer.