Issue #1869642 by kerasai: Fix placeholder documentation in batch API progress message
Issue #1629994 by oadaeh, Aron Novak, yurtboy: Reference correct RFC in mail functions documentation
Merge branch '6.27-security' into 6.x
Now onto Drupal 6.29-dev
Issue @2062127 by rhm50, jlindsey15, joachim: Fix documentation of system_requirements() to say it is a hook implementation
Merge tag '6.29' into 6.x

6.29 release

Conflicts:
	CHANGELOG.txt
	modules/system/system.module
Drupal 6.30 fixes
Drupal 6.30 - a security update advised for all sites.
See https://drupal.org/SA-CORE-2014-001 for details.