Second stage of the new year's storage rewrite.

* documents of only three types:
  * flags
  * headers
  * content
* add algorithm for walking the parsed message tree.
* treat special cases like a multipart with a single part.
* modify add_msg to use the walk routine
* modify twisted interfaces to use the new storage schema.
* tests for different multipart cases
* fix multipart detection typo in the fetch

This is a merge proposal for the 0.5.0-rc3.

known bugs
----------
Some things are still know not to work well at this point
(some cases of multipart messages do not display the bodies).

IMAP server also is left in a bad internal state after a logout/login.

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