udit_job and checksum_audit_logs updated to account for changes in Fedora 4.

Notice that ChecksumAuditLog.prune_history now expects a pid rather than a version as the parameter. In addition, Audit.logs() now does not expect a parameter.

Conceptually, the bigger change is that now ChecksumAuditLog will NOT include the datastream ID when it saves the data. Instead we are saving the full URI of the resource that was audited. This URI could be /content or /content/fcr:versions/versionX. The MySQL table checksum_audit_logs remains unchanged. Later on we could update the table with a new column name if we want to.

AuditJob was also refactored to receive only the ID of the object and the URI of the resource to audit. The URI could be the one of the content or one of its versions.