message: Even if CGAL was requiring boost::thread no need to find it for gudhi. boost::thread removed from cgal on
diff: # This files manage third party libraries required by GUDHI
  -find_package(Boost 1.56.0 QUIET OPTIONAL_COMPONENTS system thread filesystem unit_test_framework program_options)
  +find_package(Boost 1.56.0 QUIET OPTIONAL_COMPONENTS filesystem unit_test_framework program_options)
  # Boost_FOUND is not reliable
  if(NOT Boost_VERSION)
  