Issue #1040790 by yched, swentel, geerlingguy, justin.randell, Berdir | catch: Fixed _field_info_collate_fields() memory usage.
Add note to CHANGELOG.txt pointing to the change notification for the _field_info_collate_fields() memory usage commit.
Minor wording change in CHANGELOG.txt.
Issue #1879022 by omegamonk: Fixed Enforced dependencies errors updating to recent versions of Drupal 7.
Add issue #1879022 to CHANGELOG.txt.
Issue #1885000 by cck: Add link in hook_theme docs to theme layer page
Issue #1397346 by Albert Volkman, kristiaanvandeneynde, larowlan, bobbyaldol, tim-e, shiff2kl, FatGuyLaughing: Add and fix up documentation in image and node module files
Issue #1889738 by andybroomfield: Add information to documentation of hook_custom_theme
Issue #1908194 by  richard.c.allen2386: Document what happens in drupal_get_path if the file is not found
Issue #1908192 by mitron: Document what happens in drupal_get_filename() if the file is not found
Drupal 7.20
Merge tag '7.20' into 7.x
Issue #1794012 by dcam, Crell,  Lars Toomre: Remove t() from asserts in database system tests
Issue #1792380 by theo_: Fixed DatabaseCondition not cloning SelectQuery value object.
Issue #1012620 by Berdir, kbasarab, YesCT: Fixed Unique key on date_formats().(format|type) is problematic for case insensitive collations.
Issue #1266572 by znerol, joshf: Fixed Workaround in UpdateQuery_sqlite() for affected rows count causes certain updates to be suppressed.
Issue #1923554 by David_Rothstein, pwolanin, mitron | alfaguru: Fixed New anti-DoS measure breaks for some file URIs.
Issue #1347914 by Albert Volkman, Lars Toomre, batigolix, NROTC_Webmaster, xjm, sven.lauer: Fix up API docs for Filter module
Issue #1916928 by Alexander Pyle, YesCT, twistor: Document that clickLink is case sensitive
Issue #1932354 by Alexander Pyle: Fix up documentation for image_scale()