merged [80550], allowing users to force result_of to use decltype

svn path=/branches/release/boost/signals2.hpp; revision=80551
Merge bug fixes to release; Fixes #7399 Fixes #7400 Fixes #7401

svn path=/branches/release/boost/signals2.hpp; revision=80670
Merge doc fixes to release; Fixes #7244

svn path=/branches/release/boost/signals2.hpp; revision=80694
Merged Boost.Graph changes from trunk

svn path=/branches/release/boost/signals2.hpp; revision=80740
Changed version to 1.53

svn path=/branches/release/boost/signals2.hpp; revision=81305
Merge to release.  Fixes #7712


svn path=/branches/release/boost/signals2/; revision=81432
Merge macro changes for Boost.Signals2 to release

svn path=/branches/release/boost/signals2/; revision=81709
Merge deprecated macro change for Boost.LocalFunction to release; no functionality change

svn path=/branches/release/boost/signals2.hpp; revision=81851
Merged from trunk.  Closes #8102.  Closes #8103.  Closes #8115.

svn path=/branches/release/boost/signals2/; revision=83102
Merged boost::algorithm::gather and updated tests for Utility, Algorithm and Utility libraries

svn path=/branches/release/boost/signals2.hpp; revision=83154
merge [82960] to release, fixes #7663

svn path=/branches/release/boost/signals2.hpp; revision=83381