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/ceval.c b/Python/ceval.c
index dc1aa52..7c7116c 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4056,7 +4056,7 @@
      PyType_FastSubclass((PyTypeObject*)(x), Py_TPFLAGS_BASE_EXC_SUBCLASS))
 
 #define CANNOT_CATCH_MSG "catching classes that don't inherit from " \
-			 "BaseException is not allowed in 3.x."
+			 "BaseException is not allowed in 3.x"
 
 static PyObject *
 cmp_outcome(int op, register PyObject *v, register PyObject *w)