Log Message:
Import free-1.0: Displays memory usage

Many users with a linux-background expect the command free, here it is,
based on NetBSD's vmstat.

>From bsdforums.org \ 
(http://www.bsdforums.org/forums/showthread.php?s=&threadid=13410),
with permission by the author Karsten Kruse <tecneeq@tecneeq.de>