Remove cruft from brain
Generalize shuffle() to daemonize()
Engage maximum Scarecrow mode!

The brain is no longer present. Instead, there's one simple function
as part of database.py, designed to be daemonized, doing the same job.
Make explicit daemon thread functions in place of shufflers
ws
Use a dict comp instead of a list comp and a dict() call (we already require Py2.7)
Mark shuffler as unused

It's simple enough that it's okay to keep around, but basically, this
is all that's left of hotswap.Hotswap().