Update docs of Boost.Variant. Add advice about recursive_wrapper performance (refs #7718)

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Add tentative support for user-defined-literals.

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Fix undefined behaviour.

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geometry.index: query_visitor_incremental - index to current value replaced by pair of iterators

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Thread: update the externally_locked_stream interface.

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Thread: update externally_locked.

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Multivisitors commit (refs #8459)

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basic_formatting_ostream no longer derives from std::basic_ostream, but rather reimplements its and its base classes interface closely. This solves problems with overloading operator<< for basic_formatting_ostream and user-defined types. This will break user's code if it relied on the inheritance from the standard stream types (such as passing basic_formatting_ostream object as an argument to a function receiving std::basic_ostream).

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Updated modification date.

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Added Boost.Log failure markup.

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Added a workaround for MSVC that allows to prevent conversion to void*.

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Corrected comment.

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Fix #8066: Conflict with Boost.Log on GCC 4.4

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geometry.index: added experimental end_query_iterator which may be compared with spatial_query_iterator or nearest_query_iterator to check if query is finished.

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geometry.index example: added end_query_iterator to benchmark_experimental.

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