RDF Detla - recording changes to RDF Datasets

[Andy Seaborne]

I started writing up a format for transferring changes between dataset 
copies (copies in time and in location).

https://cwiki.apache.org/confluence/display/JENA/RDF+Delta
Still rough and ready but I hope it gives a general impression of the 
format and usage.

Comments, thoughts, discussion here on dev@ please.

        Andy