Make a correction to the description of invocation with-versus-without
arguments, making things a bit more clear [hopefully].
Document remaining undocumented modules (and remove my silly place-holder
thing at the top, which I was using as a way to make sure I didn't forget
to document any modules).
Adhere to 80-column width.
Oops, r252810 forgot to hook the new example file (browse_packages.sh) into
the Makefile.