test/test_rank_filter.cxx: Switch to using Boost's test framework.
test/test_rank_filter.cxx: Switch to using Boost's test framework.

DudLab/rank_filter,DudLab/rank_filter,jakirkham/rank_filter,nanshe-org/rank_filter,DudLab/rank_filter,nanshe-org/rank_filter,jakirkham/rank_filter,nanshe-org/rank_filter,jakirkham/rank_filter