Make Py3k warnings consistent w.r.t. punctuation; also respect the
EOL 80 limit and supply more alternatives in warning messages.
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 6df3005..799db20 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -1531,7 +1531,7 @@
 #ifndef PGEN
 		if (Py_Py3kWarningFlag && token == NOTEQUAL && c == '<') {
 			if (PyErr_WarnExplicit(PyExc_DeprecationWarning,
-					       "<> not supported in 3.x",
+					       "<> not supported in 3.x; use !=",
 					       tok->filename, tok->lineno,
 					       NULL, NULL)) {
 				return ERRORTOKEN;