Ticket 51260 - improve tests and improve readme re refdel
    
    Bug Description: This is a supplement to 51260.
    
    Fix Description: This expands the test cases to be able to detect
    the subsequent data corruption of 51260. This also improves
    documentation around the rfc, and some todo comments for
    future work with entryuuid + openldap.
    
    fixes #51260
    
    Author: William Brown <william@blackhats.net.au>
    
    Review by: ???