First stage of the storage schema rewrite.

* Separates between flags, docs, body and attachment docs.

* Implement IMessageCopier interface: move and have fun!
  This little change is known to push forward our beloved architect
  emotional rollercoster.

* Message deduplication.

* It also fixes a hidden bug that was rendering the multipart mime
  interface useless
  (yes, the "True" parameter in the parsestr method).

* Does not handle well nested attachs, includes dirty workaround that
  flattens them.

* Includes chiiph's patch for rc2:

 * return deferred from addMessage
 * convert StringIO types to string
 * remove unneeded yields from the chain of deferreds in fetcher

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