* Removed unused globals and local variables.
* Use Message class.
* Remove PHP4-ism from recaptchalib.php.
* Remove superfluous newlines.
* Add missing semi-colon in ext.confirmedit.asirra.js.
* Fix up some documentation.
Change-Id: I8916003d083a8c00aeabc9e485cc9a50030f0982