[issue2819] Full precision summation

[Jean Brouwers]

Jean Brouwers <MrJean1 at Gmail.com> added the comment:

There may be another reason to use a single summation function.  The 
summation functions does need (a copy of) the is_error() function from 
the math module.

The cmath module has a similar function called math_error() which 
slightly different from is_error().

It would be better, more consistent if both modules used the same 
function, say is_error() moved** to file Object/floatobject.c

Then, the math and cmath module can use ist_error() instead of each 
their own.  Also, the summation function can use it and function 
float_pow() in floatobject.c could.

/Jean Brouwers

**) and renamed to e.g. float_error().

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