xlisten

prove_subclass, prove_arity now exported;
minor internal changes;

#! /bin/sh
#  xlisten -- start a program in one window and create a listener window
#     environment variable $LISTEN specifies the file name

#create the file!
date > $LISTEN

xterm -geo 80x10+0+0 -T Listener -n Listener -e tail -f $LISTEN &
sleep 2
xterm -geo 80x45+0-0 -e teeinput $* &