FP exceptions made optional and disabled by default

new CLA --detect_fp_exceptions=[yes|no] introduced

[SVN r40165]

libs/test

@@ -1 +1 @@
-Subproject commit 9786c1a3d21d6bff61501e1af037fd4a5aae06e6
+Subproject commit a20efe579a331f828bc406fb08f1c5c94875b957