Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2594845 by er.manojsharma, tarekdj, snehi, dpopdan, anil280988, jhodgdon, cilefen: Many database driver classes have no class doc blocks

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Initial move and rename of database classes to PSR-0 namespaces.  So far only MySQL has been converted.

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.

- Patch #715108 by Damien Tournoud, Berdir, Josh Waihi, Crell, chx, justinrandell: Make merge queries more consistent and robust.

#331951 by aspilicious, sun, jhodgdon, Morbus, et al: Figure out and apply coding standard for casting.

- Patch #432128 by Berdir: adding some babysitting code to insert queries -- don't execute query when there are no values.

- Patch #332002 by Crell et al: MergeQuery should refuse to execute if there are no key fields.  With tests.

#329224 by boombatower and chx: November Make-All-Tests-Pass-Again-Extravaganza: Fix notices in block tests.

- Patch #225450 by Crell, chx, bjaspan, catch, swentel, recidive et al: next generation database layer for Drupal 7.