Use canonical form of aq_acquire (function instead of method)

lib/python/AccessControl/ImplPython.py

@@ -293,7 +293,7 @@ class ZopeSecurityPolicy:
                         raise Unauthorized(name, value)
                 else:
                     # Try to acquire roles
-                    try: roles = container.aq_acquire('__roles__')
+                    try: roles = aq_acquire(container, '__roles__')
                     except AttributeError:
                         if containerbase is not accessedbase:
                             if self._verbose:

lib/python/AccessControl/Implementation.py

@@ -95,7 +95,7 @@ _policy_names = {
 
 
 # start with the default, mostly because we need something for the tests
-setImplementation("C")
+setImplementation("PYTHON")
 
 # allow the implementation to change from the default
 _implementation_set = 0