Merge pull request #68 from Klap-in/pdo

Update PDO
Dataresolve fixed and improved for title type
column values of page(with useheadings) and title type are resolved to the first heading of given page. When empty, nothing is found. Added the original columnvalue to headingstring, so at least the pagename can be matched.
Merge remote-tracking branch 'upstream/pdo' into pdo