better error messages for 'absent' queues on declaration

- change amqqueue:internal_declare to return {absent, Q} instead
  of 'not_found'
- let this ripple through amqqueue_process:declare, stopping with
  {absent, Q} instead
- that in in turn will end up in in amqqueue:declare/5. Instead of
  inovking misc:not_found(QName), which was EXITing, we make {absent,
  Q} part of the API.
- at the call site in the channel we handle the new {absent, Q} case
  and produce a nice error message.

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