bignum 1.0

Usage: bignum [options] <big number>

	Options:
	-h
	--help			Show this help and exit
	-c
	--closest		Round off to the nearest SI unit	
	-s <significant digits>
	--sign=<significant digits>
				Number of significant digits
	-u <unit>
	--unit <unit>		SI unit (m, kg, l...)s
        -v
        --version               Print version and exit

	Examples:
	bignum 500000 -> 500k
	bignum -c 500000 -> 0.5M
	bignum -s 2 7870977786795764 -> 7.87P
	bignum -u kg 9999999999999999 -> 10Pkg