Update contao211 to 2.11.7 (Contao 2.11.7, LTS release).

Version 2.11.7 (2012-11-29)
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### Fixed
Only execute runonce files after the DB tables have been created (see #5061).

### Fixed
Add an empty option in the TimePeriod widget if there are none (see #5067).

### Fixed
Handle auto_items in the `Frontend::addToUrl()` method (see #5037).

### Fixed
Do not use `specialchars()` in the "page" insert tag (see #4687).

### Fixed
Set the return path when sending e-mails (see #5004).

### Fixed
Handle border color names when importing style sheets (see #5034).

### Fixed
Prevent the "Illegal string offset" error in back end widgets (see #4979).

### Fixed
Handle dependencies when updating extensions (see #3804).

### Fixed
Switched all comments of the example website to "moderated" (see #4995).

### Fixed
Replaced the automatic copyright notice with a meta generator tag.

### Fixed
Remove HTML tags when overriding the page title (see #4955).

### Fixed
Decode entities in meta tags like "description" (see #4949).

### Fixed
Remove newsletter subscriptions when a member closes his account (see #4943).

### Fixed
Prevent deleting referenced content elements using "edit multiple" (see #4898).

### Updated
Updated SwiftMailer to version 4.2.1 (see #4935).

### Fixed
Set the file permissions depending on the server's umask setting (see #4941).

### Fixed
Correctly handle external image URLs in the image element (see #4923).

### Fixed
Fixed the too eager IP address anonymization (see #4924).

### Fixed
Fixed the automatic page alias generator (see #4880).

(taca)