Merge changes from [79575] to Release; fixes #4999

svn path=/branches/release/libs/signals/; revision=79709
Merge program_options revisions 79280 and 79283.

svn path=/branches/release/libs/signals/; revision=79758
Merged r79227 from trunk, hopefully fixing all VC++ Boost.Graph Graphviz test issues

svn path=/branches/release/libs/signals/; revision=79771
merged [80550], allowing users to force result_of to use decltype

svn path=/branches/release/libs/signals/; revision=80551
Merge bug fixes to release; Fixes #7399 Fixes #7400 Fixes #7401

svn path=/branches/release/libs/signals/; revision=80670
Merge doc fixes to release; Fixes #7244

svn path=/branches/release/libs/signals/; revision=80694
Merged Boost.Graph changes from trunk

svn path=/branches/release/libs/signals/; revision=80740
Merge signals bug fixes from the trunk.

svn path=/branches/release/libs/signals/; revision=80978
Changed version to 1.53

svn path=/branches/release/libs/signals/; revision=81305
Merge deprecated macro change for Boost.LocalFunction to release; no functionality change

svn path=/branches/release/libs/signals/; revision=81851
Merged boost::algorithm::gather and updated tests for Utility, Algorithm and Utility libraries

svn path=/branches/release/libs/signals/; revision=83154
merge [82960] to release, fixes #7663

svn path=/branches/release/libs/signals/; revision=83381