Make Py3k warnings consistent w.r.t. punctuation; also respect the
EOL 80 limit and supply more alternatives in warning messages.
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 89e7e30..e733cee 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -174,8 +174,8 @@
 
 	if (Py_Py3kWarningFlag &&
 	    PyErr_Warn(PyExc_DeprecationWarning,
-		       "sys.exc_clear() not supported in 3.x. "
-		       "Use except clauses.") < 0)
+		       "sys.exc_clear() not supported in 3.x; "
+		       "use except clauses") < 0)
 		return NULL;
 
 	tstate = PyThreadState_GET();