[issue7633] decimal.py: type conversion in context methods

[Juan José Conti]

Juan José Conti <jjconti at gmail.com> added the comment:

1) Agree. Extra checks removed.
2) My mistake. Fixed.
3) Fexed.
4) Methods documentation fixed. Also added examples.
5) Fixed
6) Allow ints in the following unary methods (all except the ones excluded by skrah in cdecimal):
- abs
- canonical
- copy_abs
- copy_decimal
- copy_negate
- exp
- is_finite
- is_infinite
- is_nan
- is_normal
- is_qnan
- is_signed
- is_snan
- is_subnormal
- is_zero
- ln
- log10
- logb
- minus
- next_minus
- next_plus
- sqrt
- to_*_string
- to_integral_*

(also documented them properly as in 4)

copy_sing fixed and documented to have the same behaibour.

Ans a change in Doc/library/decimal.rst to reflec the new behaibour.

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Added file: http://bugs.python.org/file16032/issue7633_jjconti3.patch

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<http://bugs.python.org/issue7633>
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