Feature request: Tabular form to grade HumanGradedTextQuestion submissions in bulk

Maybe also obscuring student names for objectivity. May also be shuffled.

Instructor should see the table of submitted ungraded answers and be able to quickly fill in grades with keyboard (typing grades interleaved with Tab or Enter).

A page should correspond to individual question.

```
Grading page for question idquest1 from flow idflow1

---
What is a foo?

---
like bar | 30%
foo, bar, widget | 40%
generic name | 50%
A metasyntactic variable. | 100%
don't know | 0%
something |
whatever |

---
[Submit]
```