* Updated test_file_rebroadcasts.cpp to have same root process wait condition as test_rebroadcast_ring.cpp
* Added default slack time of 1ms to test_rebroadcast_ring.cpp 
* Updated version to 1.6.15

git-svn-id: http://madara.googlecode.com/svn/trunk@1313 2850746a-f1c8-11dd-b507-8b4ecd5210be