bytestring support for py/rna - this is so py can access data which

isn't meant to be accessed as unicode text.

source/blender/python/intern/bpy_props.c

@@ -74,6 +74,7 @@ static EnumPropertyItem property_subtype_string_items[]= {
 	{PROP_FILEPATH, "FILE_PATH", 0, "File Path", ""},
 	{PROP_DIRPATH, "DIR_PATH", 0, "Directory Path", ""},
 	{PROP_FILENAME, "FILENAME", 0, "Filename", ""},
+	{PROP_BYTESTRING, "BYTE_STRING", 0, "Byte String", ""},
 	{PROP_TRANSLATE, "TRANSLATE", 0, "Translate", ""},
 
 	{PROP_NONE, "NONE", 0, "None", ""},