record all files that fail checksum validation

[lydiam]

Currently, when a SIP contains one or more files that fail checksum validation, only the following generic message is recorded in operations_events.notes: "..outcome: reject; failure reason: At least one datafile failed checksum check;"

Please list the original file names of all files that fail checksum validation in operations_events.notes for use in reporting. This will give operators and Affiliates the ability to look up the details for failure after submission.

[flazz]

next release of core v0.7.0 takes care of this