+ // add a new line to the file: note the hack for the root group
+ // which is special in that it doesn't have its own group line
+ // (something like "[/]") and so the line we get for it may be not
+ // its line at all if it doesn't have any entries
+ //
+ // this is definitely not the right place to fix it but changing
+ // the root group to have NULL m_pLine will probably break too
+ // much stuff elsewhere so I don't dare to do it...