* Don't show edit permissions errors on a red link click, just redirect to the articl...

* Don't show edit permissions errors on a red link click, just redirect to the article. This is so that readers who don't know what a red link is aren't confused when they are told they are range-blocked.
* Put "not yet written" in the title attribute of red links, so that readers unfamiliar with the site might guess what the colour means.
* Fixed minor bugs and refactored code in the vicinity of EditPage::edit().