added compatibility to obsolete py2-function pybytes() (#344)

After update old ZMS4/Py2 templates/py-script string processing errors with pybytes() may occur. This former charset fixing function does not exist anymore. For a smother updating it is synonymized with pystr() now.

Products/zms/standard.py

@@ -72,6 +72,9 @@ def pystr(v, encoding='utf-8', errors='strict'):
       v = str(v)
   return v
 
+security.declarePublic('pybytes')
+# Just for compatibility of old ZMS4 templates.
+pybytes = pystr
 
 # Umlauts
 umlaut_map = {