Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

#809698 follow-up by Damien Tournoud, Josh Waihi, chx: Add CONCAT() function to PostgreSQL since || isn't supported reliably across database systems.