[Python-3000] Need Decimal.__format__

[Talin]

I'm looking for a volunteer who understands the Decimal class well 
enough to write a __format__ method for it. It should handle all of the 
same format specifiers as float.__format__, but it should not use the 
same implementation as float (so as to preserve accuracy.)

Also, I'm interested in suggestions as to any other standard types that 
ought to have a __format__ method, other than the obvious Date/Time 
classes. What kinds of things do people usually want to print?

-- Talin