* Convert unicodeobject.h macros to static inline functions.
* Reorder functions to declare functions before their first usage.
* Add "kind" variable to PyUnicode_READ_CHAR() and
  PyUnicode_MAX_CHAR_VALUE() functions to only call PyUnicode_KIND()
  once.
* PyUnicode_KIND() now returns an "enum PyUnicode_Kind".
* Simplify PyUnicode_GET_SIZE().
* Add assertions to PyUnicode_WRITE() on the max value.
* Add cast macros:

  * _PyASCIIObject_CAST()
  * _PyCompactUnicodeObject_CAST()
  * _PyUnicodeObject_CAST()

* The following functions are now declared as deprecated using
  Py_DEPRECATED(3.3):

  * PyUnicode_GET_SIZE()
  * PyUnicode_GET_DATA_SIZE()
  * PyUnicode_AS_UNICODE()
  * PyUnicode_AS_DATA()
  * The implementation of these functions disable deprecation
    warnings in their body.

* PyUnicode_READ_CHAR() now uses PyUnicode_1BYTE_DATA(),
  PyUnicode_2BYTE_DATA() and PyUnicode_4BYTE_DATA().
* Replace "const PyObject*" with "PyObject*" in _decimal.c
  and pystrhex.c: PyUnicode_READY() can modify the object.
* Replace "const void *data" with "void *data" in some unicodedata.c
  and unicodeobject.c functions which use PyUnicode_WRITE(): data is
  used to modify the string.