Improved testing

test/bigfile-test.sh -- 4gig+ file test

test/hammernfs.c -- output changed to s-expressions so the forthcoming
		    analysis program can more easily read the data

test/hammernfs.exe -- removed -- no reason to store the binary here

test/performance.sh -- revamped

test/stress-test.sh -- revamped

test/testnfs.c -- print system() commands to stdout

New docs are work in progress