Branch for adding initializer list support (only in the unreleased gcc 4.4 at the moment).

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Add tests for BOOST_NO_INITIALIZER_LISTS. Refs #2332

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Add the BOOST_NO_INITIALIZER_LISTS configuration to the compiler configuration files. Regs #2332

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Ralf's mpl patches for gcc 4.4. Needed to be able to test initializer list support.

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Merge from trunk to make sure I don't accidentally merge the accidental initialize-list commit and rollback.

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