[issue17911] traceback: add a new thin class storing a traceback without storing local variables

[Nick Coghlan]

Nick Coghlan added the comment:

I think in this case, the fact that it's easier to decompose an exception
into the corresponding triple rather than vice-versa, together with the
fact that other exception state manipulation APIs like exc_info() and
__exit__() methods work with triples, means it makes sense to accept the
triple as the base constuctor API, and then have the convenience method to
destructure a caught exception.

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<http://bugs.python.org/issue17911>
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