Ratio: import from Trunk

[SVN r70365]

status/Jamfile.v2

@@ -111,6 +111,7 @@ run-tests libs :
     python/test                 # test-suite python
     random/test                 # test-suite random
     range/test                  # test-suite range
+    ratio/test                  # test-suite ratio
     rational/test               # test-suite rational
     regex/test                  # test-suite regex
     regex/example               # test-suite regex-examples