add method path_to_dn() to convert a given "path" to a DN path_to_dn() replaces the occurrences of '~', '.' and '..' in a path given and returns a DN. However, it does not check whether the DN is valid. Especially: - on return it is not guaranteed that the DN exists - on return the first part does not need to be a valid RDN

mkdir: support more objectclasses Depending on the naming attribute given, support the objectclasses 'country' and 'organization' in addition to the default 'organizationalUnit'.