realtime sky drawer for X root window

options:
	-refresh <seconds>
	-verbose
	-locate [NS]<degrees>/[EW]<degrees>
	-width <degrees>
	-center <degrees>
	-horizon <dots>
	-vcell <dots>
	-hcell <dots>
	-lesscolor
	-cloudy

For example:
	xskyroot -width 36 -center 270