Make sure the semantics of Weave.Service.checkUsername and Weave.Service.createAccount don't change when used by the old UI code (as present in current Firefox 4.0 betas).
The Weave.Service.account property holds whatever the user entered for email address/username. If it only contains characters valid for usernames, it is assumed to be a username. Otherwise it's SHA1 hashed and base32 encoded.
The special tab mangling (to avoid broken Basic Auth headers) is now obsolete.
--HG--
rename : services/sync/tests/unit/test_service_checkUsername.js => services/sync/tests/unit/test_service_checkAccount.js
UTF8-encode passwords when creating accounts, changing passwords, and when authenticating. Detect old low-byte only passwords on the server and reupload them as UTF8.
