genzipf: test zipf/pareto values for fio input
	-h	This help screen
	-p	Generate size of data set that are hit by this percentage
	-t	Distribution type (zipf, pareto, or normal)
	-i	Distribution algorithm input (zipf theta, pareto power,
		or normal % deviation)
	-b	Block size of a given range (in bytes)
	-g	Size of data set (in gigabytes)
	-o	Number of output rows
	-c	Output ranges in CSV format