Synchronised with doc/extending/*.txt

doc/extending/cop.txt

@@ -308,6 +308,8 @@ version that it produces in the code I gave above.
 
    class BinaryDoubleOp(gof.Op):
 
+       __props__ = ("name", "fn", "ccode")
+
        def __init__(self, name, fn, ccode):
            self.name = name
            self.fn = fn

doc/extending/fibby.txt

@@ -35,12 +35,7 @@ you should check the strides and alignment.
     """
     An arbitrarily generalized Fibbonacci sequence
     """
-
-    def __eq__(self, other): 
-      return type(self) == type(other)
-
-    def __hash__(self):
-      return hash(type(self))
+    __props__ = ()
 
     def make_node(self, x):
       x_ = tensor.as_tensor_variable(x)

doc/extending/op.txt

@@ -682,16 +682,12 @@ arithmetic operators:
 
    class BinaryDoubleOp(gof.Op):
 
+       __props__ = ("name", "fn")
+
        def __init__(self, name, fn):
            self.name = name
            self.fn = fn
 
-       def __eq__(self, other):
-           return type(self) == type(other) and (self.name == other.name) and (self.fn == other.fn)
-
-       def __hash__(self):
-           return hash(type(self)) ^ hash(self.name) ^ hash(self.fn)
-
        def make_node(self, x, y):
            if isinstance(x, (int, float)):
                x = gof.Constant(double, x)