pixmirror: do not swap the global orientation for each picture, only local
pixmirror: add --pad/--no-pad option to pad image
pixmirror: die on malformed args
pixmirror: add --pad-color option for padding background
pixmirror: fix deadly bug in getPix()
pixmirror: add --pad-gravity option to set gravity when padding
bg-pixmirror: add a script to run pixmirror on backgrounds
pixmirror: ensure dest dir exists