Issue #2469941 by wadmiraal, jhodgdon: Move database-related hook docs from system.api.php to a new database.api.php file

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 #2167379 by Elijah Lynn, filijonka: db_select docblock should list optional parameters as (optional)

Issue #2275877 by Mixologic, duellj, Les Lim, Xano, David Strauss: Replace master/slave terminology with primary/replica.

Issue #2259361 by jweowu | David_Rothstein: Document that db_query_temporary() can only be used on SELECT queries.

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

Issue #1498674 by plach, das-peter, Schnitzel, dawehner, YesCT, attiks, Berdir, Gábor Hojtsy, Soul88, Carsten Müller: Refactor node properties to multilingual.

Issue #1833516 by Berdir, chx, catch, webchick: Add $settings for low-level configuration - move things out of .

This reverts commit 405c5fbd.