fixed bugs from syntax migration

- a new wrapper for a read function is not only to be created when
  the a new read function is in the class dict, but also when
  it inherited, but not yet wrapped
- a proxy class must not call checkProperties

secop/proxy.py

@@ -122,6 +122,8 @@ class ProxyModule(HasIodev, Module):
                     self.announceUpdate(pname, None, readerror)
                 self.announceUpdate('status', newstatus)
 
+    def checkProperties(self):
+        pass # skip
 
 class ProxyReadable(ProxyModule, Readable):
     pass