Thread: make use of barrier on test sync_queue/multi_thread_pass.cpp and remove some warnings in sync_queue|sync_bounded_queue/single_thread_pass.cpp tests.

git-svn-id: http://svn.boost.org/svn/boost/trunk@84911 b8fc166d-592f-0410-95f2-cb63ce0dd405
Moved distributed graph tags into graph_traits.hpp

git-svn-id: http://svn.boost.org/svn/boost/trunk@84912 b8fc166d-592f-0410-95f2-cb63ce0dd405
Changed dispatching strategy for bfs_helper

git-svn-id: http://svn.boost.org/svn/boost/trunk@84913 b8fc166d-592f-0410-95f2-cb63ce0dd405