Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2476225 by pixel5, cilefen, disasm, jhodgdon, TravisCarden: Doxygen on SuspendQueueException mentions non-existent callback_queue_worker()

Issue #1524550 by superspring, joachim, David Hernández, marthinal, socketwench, subson | jfinkel: Fixed queue cron workers can't signal a broken queue.