[issue3449] Update decimal module to version 1.68 of the IBM specification

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

P.S. I also agree with Mark that the 1.68 update should be treated as a 
bugfix and go into the next beta, preferably as soon as possible.  
Facundo and I should both agree to give it a quick and thorough review 
so that the beta is as solid as possible.

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