This does not actually set the background, but calls another
program to do it, but what makes it useful is it allows for
random images to be used as well as the last image to be
called. This makes it useful for setting the image upon
login or changing it regullarly through cron.
When it is ran for the first time it creates a ZConf config
named "zbgset" used store the settings.
PR: ports/124964
Submitted by: "Zane C.B." <vvelox@vvelox.net>
