Core and builtins
-----------------
+- Implemented PEP 3101, Advanced String Formatting. This adds a new
+ builtin format(); a format() method for str and unicode; a
+ __format__() method to object, str, unicode, int, long, float, and
+ datetime; the class string.Formatter; and the C API
+ PyObject_Format().
+
- Fixed several potential crashes, all caused by specially crafted __del__
methods exploiting objects in temporarily inconsistent state.