Create a branch for autoprefixing

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Initial work on autoprefixing

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Make scaling by x^0 a no-op

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Autoprefixed test added

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Autoprefixed more tests added

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Autoprefixed yet more tests added, and comments.

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added tests for scalars - not autoprefixed.

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Draft of autoprefixes.cpp examples.

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Added autoprefix and added more comments.  \detailed changed to \details to satisfy Doxygen.

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Typo in comment

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Added autoprefix and added more comments.  \detailed changed to \details to satisfy Doxygen.

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\detailed changed to \details to satisfy Doxygen.

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\detailed changed to \details to satisfy Doxygen.

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reverted kitchen sink.cpp link.

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Cut the number of template instantiations

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Fix tests for gcc

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Added thing_base_unit and euro_base_unit examples.

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Doxygen file info updated.

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Doxygen file info updated.

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Revert spurious changes

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