the simplest setup for DAViCal is to copy the "caldavzap" directory into the /usr/share/davical/htdocs/ and then open the URL in the browser. If this setup (without any config.js and/or DAViCal apache configuration changes) not works for you, then you have problem with your DAViCal installation (and need to contact the DAViCal mailing list).
I was afraid of that. Oh well, I guess I now know what to do in the spare days coming up