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

Issue #2042239 by tbradbury, pkiraly, lucaslg, pjonckiere, oriol_e9g, ivanchaer, jhodgdon, chx, cilefen, David_Rothstein: DeleteQuery::execute (Delete::execute() in D8) return value documentation is unusable

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

Issue #2358079 by pwolanin, Berdir: Require a specific placeholder format in db_query() in order to trigger argument expansion, and require explicit 'IN' parameter for conditions

Issue #2057809 by StephaneQ, Berdir, chx, dawehner: Fix up param/return documentation in database API

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