Add BOOST_CLASS_TEMPLATE_VERSION for versioning class templates#356
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`BOOST_CLASS_VERSION` writes a full specialization of the version trait, so it can only version a concrete class. A class template needs a partial specialization, which users previously had to write by hand and which neither the tutorial nor version.hpp explained. `BOOST_CLASS_TEMPLATE_VERSION` writes that partial specialization. Closes issue #179.
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BOOST_CLASS_VERSIONwrites a full specialization of the version trait, so it can only version a concrete class. A class template needs a partial specialization, which users previously had to write by hand and which neither the tutorial nor version.hpp explained.BOOST_CLASS_TEMPLATE_VERSIONwrites that partial specialization.Closes #179.