[debug] improve debug messages

[dbapi] cleanup shared data api: let access to transaction from dbapi, we can write it after all... Also, querydata is better named txdata

[session] cleanup session-time / cleanup-session-time... which are hard to grasp while there is no actual benefit to handle both. Now repo will close session without any activity since cleanup-session-time (24h by default), and the web authentication chain won't reconnect automatically anymore. I don't think there is a big deal in keeping repo session for such time. Also, ask the repo for latest session usage time, we can't know it for real on the web side (think of long running transactions). Closes #1083245.

[debug] when a loop is detected in a tree, log the entity involved in it to ease repair

[image js] fix image fit screen function

[idownloadable primary view] when file is an image, display attributes below the image

[selector] adjuts score returned by the adaptable selector to get correct priority over is_instance

[navigation] refactor previous / next navigation component to ease overriding

[massmailing] need edition.js for the freeezeFormButtons function

[views] link to public url when trying https without an account