revert signature of Accessibles.copy() method

no more kwds arguments, method 'merge' should be used

Change-Id: I7028d9df8b69c018dcdc0c55d3ae0f71e24ee15b

secop/modules.py

@@ -56,6 +56,7 @@ class HasAccessibles(HasProperties):
         accessibles = OrderedDict()  # dict of accessibles
         merged_properties = {}  # dict of dict of merged properties
         new_names = []  # list of names of new accessibles
+        override_values = {}  # bare values overriding a parameter and methods overriding a command
         for base in reversed(cls.__mro__):
             for key, value in base.__dict__.items():
                 if isinstance(value, Accessible):
@@ -63,17 +64,20 @@ class HasAccessibles(HasProperties):
                     if base == cls and key not in accessibles:
                         new_names.append(key)
                     accessibles[key] = value
+                    override_values.pop(key, None)
                 elif key in accessibles:
                     # either a bare value overriding a parameter
                     # or a method overriding a command
-                    aobj = aobj.copy()
-                    aobj.override(value)
-                    accessibles[key] = aobj
+                    override_values[key] = value
         for aname, aobj in accessibles.items():
-            if aobj != getattr(cls, aname, None):
+            if aname in override_values:
                 aobj = aobj.copy()
+                aobj.merge(merged_properties[aname])
+                aobj.override(override_values[aname])
+                # replace the bare value by the created accessible
                 setattr(cls, aname, aobj)
-            aobj.merge(merged_properties[aname])
+            else:
+                aobj.merge(merged_properties[aname])
             accessibles[aname] = aobj
         # rebuild order: (1) inherited items, (2) items from paramOrder, (3) new accessibles
         # move (2) to the end