[issue3112] implement PEP 3134 exception reporting

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Here is the final patch. Features:
- cleanup of internal APIs
- standardize traceback indentation (source lines are prefixed with 4
spaces)
- break cycles along the context chain (a synthetic benchmark with a
6-level deep context chain shows a very moderate slowdown of 10-15%)

Added file: http://bugs.python.org/file10753/exc_reporting.patch

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