freebsd isos
(.xz files decompress with xz)

`bootonly`: netinstall iso
`disc1`: standard installer (most normal)
`dvd1`: huge image with a lot of packages (best for offline systems)
`memstick`: raw image to be written directly to a usb (not an ISO)
`mini-memstick`: raw image to be written directly to a usb (not an ISO) but netinstall