Would it be useful to add a message or a redirection in index.html in the old subdirectory for any existing users? Or is this done automatically? I'm not sure that this level of detail is useful. If a user needs this level of detail then perhaps a script would be better and would avoid variables being set to different paths by mistyping?
When doing this I had to modify also .htaccess in particular I had to change
I am not sure if this is because of installation specifics or otherwise.