[c++0x] nested_exception

[Jonathan Wakely]

Here's a prototype implementation of std::nested_exception with some
basic tests.

The spec isn't finalised (see n2619 and LWG issue 819) so I'm not
looking to check this in, just sharing it in case anyone has comments,
improvements or spots any bugs.

I used static_cast<Ex&&> instead of std::move, because std::move would
have meant including <bits/move.h> from libsupc++

Jon
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