Invert name and namelen arguments.

Use it for the builtin __import__ function.

If the directory name contains a dot but not the filename, don't strip at the
dot.

Prepare also the API change of case_ok()

And PyImport_ReloadModule() uses Unicode for the module name.

Sorry Andrew I MacIntyre!

%R format instead of %U

Use Unicode for module name and paths in the following functions:

 * PyImport_ImportModuleLevel()
 * add_submodule()
 * ensure_from_list()
 * get_parent()
 * import_module_level()
 * import_submodule()
 * load_next()
 * mark_miss()

 * Use Unicode for module name and path in the following functions:

   * get_file()
   * load_source_module(), parse_source_module()
   * make_compiled_pathname(), check_compiled_module(),
     read_compiled_module(), load_compiled_module(), write_compiled_module(),
     update_compiled_module()

 * On Windows, use CreateDirectoryW() instead of mkdir()
 * update_compiled_module() cannot fail anymore

Use Unicode for module name and path in get_sourcefile(),
make_source_pathname() and load_package() functions.

Rename subname argument to name, and mark it as constant.

Document also the find_module() function

Document also that dynamic module names are ASCII only

 * Document the function
 * Use RegQueryValueW() instead of RegQueryValueA()
 * Use _Py_fopen() instead of fopen()
 * Allocate registry key on the heap, not on the stack, and handle memory
   allocation failure
 * Handle Python exception in find_module()

The name is an ASCII encoded string.

_PyImport_FixupBuiltin() and _PyImport_FindBuiltin() use
PyUnicode_InternFromString() instead of PyUnicode_FromString().

 - is_builtin(), init_builtin(), load_builtin() and other builtin related
   functions use Unicode strings, instead of byte strings
 - Rename _PyImport_FixupExtensionUnicode() to _PyImport_FixupExtensionObject()
 - Rename _PyImport_FindExtensionUnicode() to _PyImport_FindExtensionObject()

find_frozen(), get_frozen_object(), is_frozen_package() and other functions
related to frozen modules use Unicode strings instead of byte strings.

Replace strcmp() by PyUnicode_CompareWithASCIIString()

 - Use Unicode for module paths and names, self->archive and self->prefix
 - Format module names and paths use %R instead of '%U' to escape surrogate
   characters (PEP 383)
 - Use PyImport_ExecCodeModuleObject() instead of PyImport_ExecCodeModuleEx()
 - Use PyImport_AddModuleObject() instead of PyImport_AddModule()