Merge ScopeExit from trunk.

[SVN r50713]

status/Jamfile.v2

@@ -107,6 +107,7 @@ run-tests
     rational/test               # test-suite rational
     regex/test                  # test-suite regex
     regex/example               # test-suite regex-examples
+    scope_exit/test             # test-suite scope_exit
     serialization/test          # test-suite serialization
     signals/test                # test-suite signals
     smart_ptr/test              # test-suite smart_ptr