[boost] [thread] deprecating Mutex::scoped_lock and Mutex::scoped_try_lock and boost::condition

Hi, I would like to deprecate the following features in Boost.Thread: * Mutex::scoped_lock and Mutex::scoped_try_lock so that we can make mutex types independent from locks. The user should use instead unique_lock<Mutex> and the new public class try_unique_lock. * condition: This was there for forward compatibility since 1.35. The user should use instead condition_variable_any. What do you think? Best, Vicente