More fleshing out of the users REST API.

* Add a 'uid factory' which allows us to return predictable unique ids for
  various testing purposes, e.g. user ids.  This should work even in the case
  of cross-subprocess uid generation.
* REST access to individual users, or the set of all users.
* User objects now have a created_on attribute.
* Users can be created through the web, but must have an email address.
* Add a [devmode] 'testing' variable for communicating to qrunner subprocesses
  that we're running in testing mode.  This allows us to coordinate factories
  and such in the qrunner processes.
* layers.is_testing() for more consistent API.
* Give AddressError a .address attribute for better diagnostics.

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