* section scheduling

* reviewing the use of opendir/readdir/etc.
* mechanics of recursion for walking a directory

    opendir -- open a directory; returns a DIR*
    readdir -- read a single entry from a DIR*

similar to using stdio to iterate over a file line by line
    filep = fopen
    while str = fgets(filep)

iterate over a dir entry by entry
    dirp = opendir(dname)
    while direntp = readdir(dirp)
       use lstat to get stat struct for direntp->d_name 
       store the details from lstat
       calculate columns widths

    iterate over children, and print the info

    iterate over child dirs, and make a recursive

* TODO for Brandon: double check on the what the value of total is

* approaches for working on the assignment

    a recommendation: identify an incremental approach that can be tested
    in small chunks alongs the way

        v1: support one file
        v2: just a directory with no child directories
        v3: now handle child dirs

* error checking
    ls is "best effort" ... after a failure, it just continues on, but then
                            exits with a non-zero exit status
    for reporting errors from any function that set errno, use one of:
        fprintf(stderr, "info string: ");
        perror(infostr);

        fprintf(stderr, "info string: '%s': %s\n", filename, strerror(errno));

    nonstandard, so don't use in portable code
        fprintf(stderr, "info string: '%s': %m\n", filename);