- add attribute "create_table_attribute" to "::xo::db::Attribute" to
  contol the creation of somewhat magic attributes (e.g. "text" of the
  acs content repository)
Added transitional code for installations running with acs-kernel prior to version 5.8.1a6,
or later before running upgrade scripts: some ::xo::db::sql::utility methods would be missing,
so they are transitionally defined on the fly.
- Fixed regression in fallback utilities
- Fixed regression in ::xo::db::require table due to argment 'definition' being now in dict format
- update version numbers and dependencies
Revert changes in xo::db::require table, as new definition is already handled