Made timed_mutex incompatible with condition variable when mutex_timedwait is not available. The test had to be disabled for now because it requires condition_variable_any.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86367 b8fc166d-592f-0410-95f2-cb63ce0dd405
[geometry] revised solution for robustness, we don't go to integer which was shortly done. This is partly a revert of r85867, where we scaled to integer. Now we make side information consistent by iteratively selecting a larger epsilon. This will be moved into a separate class. All tests pass now, also the complete ticket_9081 test which failed before

git-svn-id: http://svn.boost.org/svn/boost/trunk@86368 b8fc166d-592f-0410-95f2-cb63ce0dd405