No-Excuses Mode!

We killed weaselproofing and introduced No-Excuses Mode instead.

The whole story is on the blog -- https://blog.beeminder.com/noexcuses/ -- but here's the very short version of what No-Excuses Mode means:

1. You can’t call non-legit on a derailment unless there was a Beeminder bug
2. The closing of various loopholes with autodata
3. You can’t delete the goal even in the first week