Changed Component.__init__ so that config is not deepcopy'd.

Previously, we were deepcoping the config for each component.  This 
causes overhead and it is not clear at this point that having components
share config (by reference) is a bad idea.

IPython/core/component.py

@@ -234,10 +234,18 b' class Component(HasTraitlets):'
         self.root = self # This is the default, it is set when parent is set
         self.parent = parent
         if config is not None:
-            self.config = deepcopy(config)
+            self.config = config
+            # We used to deepcopy, but for now we are trying to just save
+            # by reference.  This *could* have side effects as all components
+            # will share config.
+            # self.config = deepcopy(config)
         else:
             if self.parent is not None:
-                self.config = deepcopy(self.parent.config)
+                self.config = self.parent.config
+                # We used to deepcopy, but for now we are trying to just save
+                # by reference.  This *could* have side effects as all components
+                # will share config.
+                # self.config = deepcopy(self.parent.config)
 
         self.created = datetime.datetime.now()
 

IPython/core/tests/test_component.py

@@ -147,12 +147,12 b' class TestComponentConfig(TestCase):'
         self.assertEquals(c1.config, config)
         self.assertEquals(c2.config, config)
         self.assertEquals(c3.config, config)
-        # Test that we always make copies
-        self.assert_(c1.config is not config)
-        self.assert_(c2.config is not config)
-        self.assert_(c3.config is not config)
-        self.assert_(c1.config is not c2.config)
-        self.assert_(c2.config is not c3.config)
+        # Test that copies are not made
+        self.assert_(c1.config is config)
+        self.assert_(c2.config is config)
+        self.assert_(c3.config is config)
+        self.assert_(c1.config is c2.config)
+        self.assert_(c2.config is c3.config)
         
     def test_inheritance(self):
         class MyComponent(Component):