first part of tip 76 -- multiple packages as subsites adds a subsite::package_keys function for listing subsites, and uses it instead of hard coding acs-subsite all over
merge changes on oacs-5-1 branch to head, changes between jcd-merge-20040420 and jcd-merge-5-1-20040517 were merged, head pre changes is jcd-merge-pre-20040517 and post is jcd-merge-post-20040517