[issue1780] Decimal constructor accepts newline terminated strings

[Mark Dickinson]

Mark Dickinson added the comment:

Aargh!  It's only the Context class that needs a to_number method---it 
makes no sense as a Decimal method.  And to_number is almost already 
there, in the form of Context.create_decimal.

I'll work out exactly what the minimum is that needs to be done to 
comply with the specification, and post a patch

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<http://bugs.python.org/issue1780>
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