Sharding by Year.

Hi Michael

> outgoing/y2001  has 1287 messages  (1-1287).
> outgoing/y2002  has 9335 messages  (1-9335).
> outgoing/y2003  has 3909 messages  (1-3909).

Out of interest, how did you pick what's in each year?  Textually, with
‘2002’ appearing in the Date field.  Or as a year and if so was that
local time, the sender's time, or UTC?  :-)

-- 
Cheers, Ralph.