Revise C++ coding style using clang-format

Run the `Utilities/Scripts/clang-format.bash` script to update
all our C++ code to a new style defined by `.clang-format`.
Use `clang-format` version 3.8.

* If you reached this commit for a line in `git blame`, re-run the blame
  operation starting at the parent of this commit to see older history
  for the content.

* See the parent commit for instructions to rebase a change across this
  style transition commit.

Tests/SubProject/car.cxx

@@ -1,6 +1,6 @@
 int main(int ac, char** av)
 {
-  (void) ac;
-  (void) av;
+  (void)ac;
+  (void)av;
   return 0;
 }

Tests/SubProject/foo/foo.cxx

@@ -7,9 +7,8 @@ int main(int ac, char** av)
   (void)av;
   int ret = bar();
   printf("bar = %d\n", ret);
-  if(ret == 10)
-    {
+  if (ret == 10) {
     return 0;
-    }
+  }
   return -1;
 }