feature request: 'include' config directive

Sometimes, especially for Tor server operators with multiple Tor instances, it would be handy to include a single file into different torrc files, to avoid touching multiple files when changing a single config option that is shared throughout all instances.

A good example for such config options would be 'MyFamily' and 'ExitPolicy'.

Would be nice if you could provide a new config options that implements such a feature.

thanks, tagnaq