template::adp_include does not reset the adp_level to the previous one. so, in case of nested adp_includes, the adp_level is incorrect leading to strange errors. i fixed this only for xowiki.
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).