Several new features and improvements for dartdoc.

lib/compiler/implementation/lib/core.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#library('core');
+#library('dart:core');
 
 #import('coreimpl.dart');
 
 #import('js_helper.dart'); // TODO(ahe): remove this import.
 
 #source('../../../../corelib/src/bool.dart');
 #source('../../../../corelib/src/collection.dart');
 #source('../../../../corelib/src/comparable.dart');
 #source('../../../../corelib/src/date.dart');
 #source('../../../../corelib/src/double.dart');
@@ skipping 25 matching lines @@
 
 void print(var obj) => Primitives.printString(obj.toString());
 
 class Object {
   String toString() => Primitives.objectToString(this);
 
   void noSuchMethod(String name, List args) {
     throw new NoSuchMethodException(this, name, args);
   }
 }