[test.go] I am becoming a file sorter.

Right now I have just been playing with opening a file. I need
to make sure to close the file when I am done. I also need to
use readdir if I open a directory and then recurse. I am now using
buffered I/O, but I am doing nothing useful with the data I have.

I need to sort the input data and then output the data. Don't forget
that you will want this to work for very large input data sets, so
you will have to work on some external sort eventually.