Preparations for release.
Several changes: - Backends need no longer be listed in backends/__init__.py - New spoolerctl command "rmbackend" to remove backends that crashed or otherwise disappeared - Introduced root user; some commands now require root privileges
Added new account 'wdok' with widely known password.
Removed demo2; demo's password is md5 encrypted.
Replaced .passwd with passwd because we don't want hidden files to not confuse developers and end-users.
Replaced passwd with .passwd
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