Update drupal7 to 7.22.

Drupal 7.22, 2013-04-03
-----------------------
- Allowed the drupal_http_request() function to be overridden so that
  additional HTTP request capabilities can be added by contributed modules.
- Changed the Simpletest module to allow PSR-0 test classes to be used in
  Drupal 7.
- Removed an unnecessary "Content-Disposition" header from private file
  downloads; it prevented many private files from being viewed inline in a web
  browser.
- Changed various field API functions to allow them to optionally act on a
  single field within an entity (API addition: http://drupal.org/node/1825844).
- Fixed a bug which prevented Drupal's file transfer functionality from working
  on some PHP 5.4 systems.
- Fixed incorrect log message when theme() is called for a theme hook that does
  not exist (minor string change).
- Fixed Drupal's token-replacement system to allow spaces in the token value.
- Changed the default behavior after a user creates a node they do not have
  access to view. The user will now be redirected to the front page rather than
  an access denied page.
- Fixed a bug which prevented empty HTTP headers (such as "0") from being set.
  (Minor behavior change: Callers of drupal_add_http_header() must now set
  FALSE explicitly to prevent a header from being sent at all; this was already
  indicated in the function's documentation.)
- Fixed OpenID errors when more than one module implements hook_openid(). The
  behavior is now changed so that if more than one module tries to set the same
  parameter, the last module's change takes effect.
- Fixed a serious documentation bug: The $name variable in the
  taxonomy-term.tpl.php theme template was incorrectly documented as being
  sanitized when in fact it is not.
- Fixed a bug which prevented Drupal 6 to Drupal 7 upgrades on sites which had
  duplicate permission names in the User module's database tables.
- Added an empty "datatype" attribute to taxonomy term and username links to
  make the RDFa markup upward compatible with RDFa 1.1 (minor markup addition).
- Fixed a bug which caused the denial-of-service protection added in Drupal
  7.20 to break certain valid image URLs that had an extra slash in them.
- Fixed a bug with update queries in the SQLite database driver that prevented
  Drupal from being installed with SQLite on PHP 5.4.
- Fixed enforced dependencies errors updating to recent versions of Drupal 7 on
  certain non-MySQL databases.
- Refactored the Field module's caching behavior to obtain large improvements
  in memory usage for sites with many fields and instances (API addition:
  http://drupal.org/node/1915646).
- Fixed entity argument not being passed to implementations of
  hook_file_download_access_alter(). The fix adds an additional context
  parameter that can be passed when calling drupal_alter() for any hook (API
  change: http://drupal.org/node/1882722).
- Fixed broken support for translatable comment fields (API change:
  http://drupal.org/node/1874724).
- Added an assertThemeOutput() method to Simpletest to allow tests to check
  that themed output matches an expected HTML string (API addition).
- Added a link to "Install another module" after a module has been successfully
  downloaded via the Update Manager (UI change).
- Added an optional "exclusive" flag to installation profile .info files which
  allows Drupal distributions to force a profile to be selected during
  installation (API addition).
- Fixed a bug which caused the database API to not properly close database
  connections.
- Added a link to the URL for running cron from outside the site to the Cron
  settings page (UI change).
- Fixed a bug which prevented image styles from being reverted on PHP 5.4.
- Made the default .htaccess rules protocol sensitive to improve security for
  sites which use HTTPS and redirect between "www" and non-"www" versions of
  the page.
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

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