Checkpoint.  Manipulated things so that string literals are always
unicode, and a few other compensating changes, e.g. str <- unicode,
chr <- unichr, and repr() of a unicode string no longer starts
with 'u'.  Lots of unit tests are broken, but some basic things
work, in particular distutils works so the extensions can be built,
and test_builtin.py works.
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 17cdb92..fef001d 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -2270,7 +2270,7 @@
  	{"all",		builtin_all,        METH_O, all_doc},
  	{"any",		builtin_any,        METH_O, any_doc},
  	{"callable",	builtin_callable,   METH_O, callable_doc},
- 	{"chr",		builtin_chr,        METH_VARARGS, chr_doc},
+ 	{"chr",		builtin_unichr,     METH_VARARGS, chr_doc},
  	{"cmp",		builtin_cmp,        METH_VARARGS, cmp_doc},
  	{"compile",	(PyCFunction)builtin_compile,    METH_VARARGS | METH_KEYWORDS, compile_doc},
  	{"delattr",	builtin_delattr,    METH_VARARGS, delattr_doc},
@@ -2375,7 +2375,7 @@
 	SETBUILTIN("set",		&PySet_Type);
 	SETBUILTIN("slice",		&PySlice_Type);
 	SETBUILTIN("staticmethod",	&PyStaticMethod_Type);
-	SETBUILTIN("str",		&PyString_Type);
+	SETBUILTIN("str",		&PyUnicode_Type);
 	SETBUILTIN("super",		&PySuper_Type);
 	SETBUILTIN("tuple",		&PyTuple_Type);
 	SETBUILTIN("type",		&PyType_Type);