__init__(): Accept information for hash space slicing (slice number

and total number of slices).  Create the runner-specific switchboard,
the shunt switchboard (for messages that generate uncaught
exceptions), and the mainloop stop flag.  We also have no need for a
runner-specific lock since the qrunner watchdog infrastructure handles
all that for us now.

_dequeue(): This is no longer part of the Runner interface (it's been
moved to the Switchboard).

run(), __oneloop(), __onefile(): Rework the mainloop for flexibility
and robustness.  run() is the main loop and handles KeyboardInterrupt
exceptons, guaranteed cleanup at mainloop exit, checking the stop flag
and calling _doperiod() after each cycle through the mainloop, and
sleeping for a while if there are no files in the queue directory.

__oneloop() handles cruising through the list of all the files in the
queue (modulo any hash space slicing) exactly once.

__onefile(): handles the work for one queue file.

_snooze(): sleeps for a specified amount of time.

_log(): A convenient logging facility for subclasses

_start(), _onefile(): deleted.

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