Improve BSD licensed text-processing tools

[Jesse Hagewood]

Last week, I continued working on zdiff intergration in diff, and once I
get it working properly I will intergrate the functionality in sdiff and
diff3 also. I also began some benchmarking of sdiff using test, and noticed
that BSD sdiff had more minor pagefaults when executed with no options with
relatively small files as input.

In all honesty, not as much progress as I had anticipated was made last
week. Thursday I left to visit some relatives, and I had forgotten my
laptop charger, so I wasn't able to get any work completed. I didn't get
back home until a few hours ago. This week, I'll be working extra hours to
make up for lost time, and I expect to finally get zdiff integration
working within a day or two (the functionality is there, things just need
debugging.) Once that is completed, I'll be doing as much work as I can get
completed on diff3 before the "pencil's down" period on August 13th.