* qemud/driver.c: maintain the autostart flag on disk
        using symlinks from the "autostart" directories to
        the corresponding config files.

        * qemud/internal.h: add paths to the autostart links
        to the vm/network structures and paths to the autostart
        dirs to the server struct.

        * qemud/qemud.c: initialize the server autostart dir
        patches.

        * qemud/conf.h: expose qemudEnsureDir()

        * qemud/conf.c: check the autostart symlinks when
        loading config files at startup.