Investigate test hickups

There are some irregular test fails which happen from time to time.

I've seen two so far:

- Send 99 mails instead of 100. Might be some cache stampede because each mail triggers a variable_set() and that in turn triggers a partial cache rebuild. Maybe using apc to store the send mails would not only help with the performance of these tests but also fix this error.

- edit-activated--2 checkbox is not check. Saw this one the first time recently and also just had it in a manual test run. I think that test just happens to click the first edit link on that page. It's possible that one actually *isn't* activated.

These should be fixed...