handle subdirs and symlinks in $wallpaperdir
handle subdirs and symlinks in $wallpaperdir

Thanks for the base patch, kindly provided by some Anonymous coward
on the bugtracker ;-)

BUG: 1065

luebking/fluxbox,Arkq/fluxbox,Arkq/fluxbox,Arkq/fluxbox,Arkq/fluxbox,luebking/fluxbox,luebking/fluxbox,Arkq/fluxbox,luebking/fluxbox,luebking/fluxbox