boost/pending/: ported revision 48251 ("integer_log2.hpp and lowest_bit.hpp, in boost/pending/: little comment cleanup (svn anchors, etc.); added a static_cast<> to silence (harmless) MSVC++ warnings") from trunk

[SVN r48353]

libs/detail

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-Subproject commit b328080dbbd31cd58442b433e41f3e26513a252d
+Subproject commit 4ae97fa5cb47aa7140943e5902151459b3ec07d0

libs/dynamic_bitset

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-Subproject commit 357e43438719e74ddb57b42b26300bc14d1efd4b
+Subproject commit bddf77e5a4824fae722c8648d6c5a18eb8fb4213