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Unit tests and code fix for DATAREST-763.
Apologies I am unable to squash the commits at present as I'm working through the web UI due to access restrictions to gitHub.
This fix URL encodes/decodes entity ids to prevent the potential for invalid characters ending up in the URL. This is simply a case of encode/decode for all characters save for '/' which in its encoded form of %2F is not accepted by most webservers due to security issues (allowing for spurious modification of paths - partly what this change addresses from the DATAREST side!)
The proposed solution for this specific case is to double encode and decode the / --> %2F --> %252F which avoids this issue.