merge changes for vwr-24401

doc/contributions.txt

etc/message.xml

indra/cmake/Boost.cmake

indra/integration_tests/llui_libtest/llui_libtest.cpp

indra/linux_updater/linux_updater.cpp

indra/llaudio/llaudioengine.cpp

indra/llimage/llpngwrapper.cpp

indra/llimage/llpngwrapper.h

indra/llvfs/CMakeLists.txt

indra/llvfs/lldir.cpp

indra/llvfs/lldir.h

indra/llvfs/lldir_linux.cpp

indra/llvfs/lldir_linux.h

indra/llvfs/lldir_mac.cpp

indra/llvfs/lldir_mac.h

indra/llvfs/lldir_solaris.cpp

indra/llvfs/lldir_solaris.h

indra/llvfs/lldir_win32.cpp

indra/llvfs/lldir_win32.h

indra/llvfs/lldiriterator.cpp