In trying to make Chris Deeming's auto-installer add-on work, I've found that the likely problem is that my XF files & folders are owned by me whereas Apache runs as a different user (www-data) and don't have write permission to the library/, js/ etc folders and files inside. So what is the best solution to this? Would I be compromising security by changing the owner of all XF files & folders to www-data? Or should I just give write permissions to everyone (chmod 0777 on folders, chmod 0666 on files)? My site is running on a VPS and I have full control over everything.