New DataFrame display information?
We are using DataFrames to hold information in a lot places now. E.g., ANOVA tables

```
            df  sum_sq     mean_sq          F    PR(>F)
C(Fitness)   2     672  336.000000  16.961538  0.000041
Residual    21     416   19.809524        NaN       NaN

[2 rows x 5 columns] 
```

Where'd that bottom `[]` business come from? Is this new? Isn't this something that's better included in the `info` method?
