Design input files that properly exercise available compression algorithms

[ssokolow]

Now that I've got a copy of StufIt Deluxe 9.5, I have a clean, handy, obvious way to select between "none", "ISP", and "Arsenic" for "Compression Method" on .sit files, but I now have good reason to come up with test files that don't cause StuffIt to fall back to "none" due to a lack of sufficient compressibility.

...probably something I'll want to do after I've got a solution for automating all this from a Makefile so I can just tweak the input file, hit a button, get a read-out on the effects for all my available tools, and repeat until I'm happy with the results.