upgrade to version 0.27. alignment with xotcl-core 0.38 (use cr_item.name instead of cr_revisions.title), change page_title to title (potential incompatibility) to rely more strictly to the CR data model (most files are effected).
upgrading to 0.22, fixing permission handling, added link to admin page, unitfied pretty_url handling, tested with oacs 5.1, more robust upgrade handling