  Re: cmdline.ss library in PLT  I have briefly reviewed the
cmdline.ss documentation. Let me say up front that there are a
lot of ways to this job, and I doubt any way is perfect. My goal
with args-fold was to provide a useful, generic, and flexible
interface to the Posix/GNU guidelines in "the spirit of Scheme".
Arguments could be made about my design choices from two
directions: about the programmer's interface, about the user's
interface.  Here are my notes about cmdline.ss:  1. Cmdline
seems to have a mandatory builtin help system. In args-fold, a
help option in handled by the programmer like any other option.
2. Cmdline seems to support more than one argument per option.
Args-fold supports 0 or 1 arguments per option, following the
lead of POSIX/GNU  3. At first, I thought it would be possible
to implement cmdline in terms of args-fold, but I believe the
cmdline interface requires a "procedure-arity" implementation.
This is a clever trick that takes advantage plt-scheme, but I
think it also prevents cm