Make source code check for configure-generated portability features
like HAVE_UNISTD_H.

Add better support for devfs devices.

Look at internationalization of output messages. Giuseppe De Marco
<gdm@rebel.net> has sent me an Italian version of the docs and source
code, but I'd like to do it properly (probably using GNU gettext).

Make a (limited) version for SunOS and Solaris.

Add ZIP drive read/write functions (from ziptool).

Open SourceForge project :-)
