Testing the switch to uid-based IMAP calls required better testing
The better testing revealed some code that wasn't so pretty
I fixed the tests and the code
* Using a query parameter argument (rather than the entire query string)
to specify the folder into which e-mail messages should be archived.
* Duplicating the IMAP tests; this could probably be a bit more simply
done, but we'll at least be verifying both archived and non-archived
use cases.
* Simplifying some aspects of the documentation to include references
to this new feature.
