Synopsis
		sfsizes files=y human=n su=n file1.rsf file2.rsf ...

Prints the element size, number of elements, and number of bytes
for a list of RSF files. Non-RSF files are ignored.

Parameters
		bool files=y [y/n] If y, print size of each file. If n, print only total.   bool human=n [y/n] If y, print human-readable file size. If n, print byte count.   bool su=n [y/n] Same for Seismic Unix