Iostreams: Merge test fixes from trunk.

- Remove obselete filesystem code and test (jhunold).
- Fix gzip test failures for some C++0x compilers.

svn path=/branches/release/libs/iostreams/; revision=78433
Merging to release; Fixes #6576

svn path=/branches/release/libs/iostreams/; revision=79970
merged [80550], allowing users to force result_of to use decltype

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

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

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

svn path=/branches/release/libs/iostreams/; revision=80740
Changed version to 1.53

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

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

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

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