Based on PR#44354 by Tony Young.
set LICENSE=public-domain, unit-test support by me.
Version 0.2 2002-09-11
Added unit test framework.
Read from a list of files, rather than just one, seeking evenly within
all of them based on the number of blocks in each.
Allow reading several contiguous blocks for each seek, so we can do
sequential/random and sequential read testing.
Print more and clearer information.
Added disktest shell scripts.
