pyapi FEATURE <edit-config> implementation

ncRPCEditConfig() method of the Session to send <edit-config> to the
NETCONF server.
diff --git a/python/rpc.h b/python/rpc.h
index 262325e..9eb95da 100644
--- a/python/rpc.h
+++ b/python/rpc.h
@@ -21,6 +21,7 @@
 
 PyObject *ncRPCGet(ncSSHObject *self, PyObject *args, PyObject *keywords);
 PyObject *ncRPCGetConfig(ncSSHObject *self, PyObject *args, PyObject *keywords);
+PyObject *ncRPCEditConfig(ncSSHObject *self, PyObject *args, PyObject *keywords);
 
 #ifdef __cplusplus
 }