Pre - European CAT 2019
Fixed Test 15801 which tests that all appropriate attributes of a DocumentEntry can be updated.
Fixed #264 Folder.lastUpdateTime must be second resolution. Updated Registry simulator and tests.
Updated MU/RMU/RMD simulator code to reflect current usage of UnresolvedReferenceException.
Some bugs that are not going to get fixed before the event:
RMD now allows empty SubmissionSet to remain - test 30001 needs the additional flexibility - #457
Error reporting for MU/RMU/RMD was updated in 2018 - parts of this are still pending in the code - #456