Rename class `Type_Name` to `Type_Name_Kind`
Use `type_name`, not `Type_Name`, as column name

Up to now, some tables had a column named `Type_Name`, others had a
column named `type_name`. Now all columns holding a type name are called
`type_name`.

Fixed a bug in `MOM.DBW.SAS.SAS_Interface.value_dict`: for an unknown
`attr_name`, it used `Type_Name_Kind` instead of doing nothing.
Use `sos.expanded_path` in `_read_auth_mig`