Merge tag 'tags/7.23'

7.23 release
Allow subsecond delays for lock_wait().
Merge tag 'tags/7.24' into pressflow-7.24

7.24 release
Merge branch 'pressflow-7.24'
Merge tag 'refs/tags/7.25'

7.25 release
committing default.settings.php.
Merge tag '7.26'

7.26 release
7.27 release
Merge pull request #35 from pressflow/drupal-7.27

Drupal 7.27
Back to 7.x-dev
7.28 release

Merge tag '7.28' of https://github.com/drupal/drupal
Merge pull request #36 from pressflow/drupal-7.28

Drupal 7.28
Issue #2268947 by sachin_s, joachim: Add note to hook_field_formatter_settings_form() about when it is invoked
Issue #2276469 by decibel.places: Fixed robots.txt syntax checking link broken.
Issue #2273337 by vegantriathlete, ducktape, joachim: Fix up docs for db_add_field and related functions
Issue #2267159 by juampy, xjm, alexpott: Remove nonexistent parameter from DrupalWebtestCase::assertNoLink docs
Issue #2248799 by amitgoyal, c31ck, Wim Leers: Fix docs for system_sort_themes
Issue #2277623 by mparker17: Fix up docs for drupal_parse_url function
Issue #2263047 by joshi.rohit100, lostkangaroo, sachin_s, martin107: Fix up hook_help docs and move to system module
Use administer search permission instead of access administration pages