Moved utilities into their own subdirectory.
Added README file to utilities based on http://web.ku.edu/~keds/software.dir/utilities.html
Added filters/ subdirectory, README based on http://web.ku.edu/~keds/software.dir/filters.html, and the source code listed.
Added warning/ subdirectory, README based on http://web.ku.edu/~keds/software.dir/warning.html, and the source code listed.
Added different/ subdirectory, README based on http://web.ku.edu/~keds/software.dir/different.html, and the source code listed.
Removed unnecessary executable permissions on many files.