This commit was manufactured by cvs2svn to create branch 'RC_1_28_0'.

svn path=/branches/RC_1_28_0/boost/boost/thread/; revision=13795
Fixed xtime bugs

svn path=/branches/RC_1_28_0/boost/libs/thread/; revision=13865
Fixed several bugs in the new unit test code

svn path=/branches/RC_1_28_0/boost/boost/thread/; revision=14788