logic to determine whether to set request status to complete considers result summary datetime relative to authorisation datetime; replaced io unlink() with system unlink in render_pdf - was giving occasional errors; replaced M::Base::does_authorisation method with Moose attr to save repeat db queries; fixed oversight in _archive_report_details() causing history log to record amended specimen_date at every authorisation; gallium_data.pl checks for comment field to prevent fatal error; more report_status.t tests to test for status change on delayed result summary entry
