[boost] [thread] Missing #include

Hi, I think boost/thread/pthread/shared_mutex.hpp in trunk is missing #include <boost/thread/thread.hpp>. Now it complains it doesn't know what this_thread is. I also noticed lots of warnings "unused variable 'res'" and alikes while compiling my projects with GCC 4.2.1 on OpenSUSE. These warnings mostly come from boost/thread/pthread/pthread_mutex_scoped_lock.hpp, boost/thread/pthread/once.hpp, boost/thread/pthread/mutex.hpp, boost/thread/pthread/condition_variable.hpp. I didn't investigate closely, though.