Move Opera's DND tests into place.

We [discussed](http://krijnhoetmer.nl/irc-logs/testing/20140115#l-153) these tests in #testing today. Given that

* having them sit in old-tests doesn't help anybody
* they're probably roughly accurate
* automating them with webdriver would be a lot of work (possibly including work on webdriver), and nobody is expected to step up to do it soon
* @jgraham doesn't like the automation using platform-specific perl code that's submitted as #441
* nobody is likely to carefully review them in the near future

we're going to move those tests without further review or automation work. Comments and improvements are, as always, still welcome.