Issue #3227518 by kunal.sachdev, quietone, tedbow, ravi.shankar, gisle, phenaproxima: Never show a "Not supported!" version as "Recommended"

Issue #3108402 by lauriii, bnjmnm, FezVrasta, Wim Leers, mradcliffe, gisle: Update to Popper.js to 2.0.0

This reverts commit 2893aec5.

Issue #1003788 by stefan.r, Alan D., JimmyAx, Josh Waihi, john_brown, bellHead, twistor, wiifm, bzrudi71, pwolanin, gngn, Gisle, robhardwick: Fixed PostgreSQL: PDOException:Invalid text representation when attempting to load an entity with a string or non-scalar ID.

Issue #1379070 by ocsilalala, rkjha, swentel, kid_icarus, Gisle: Field with multiple select list does not allow -None- to be a default value.

Issue #345541 by Dave Reid, gisle, kiamlaluno: Link to contact form in user account and e-mails leads to 403.