Make the viewXMLform look almost identical to viewXMLpre, along with monospaced font.

There is still a bug where the padding of the textarea affects the scrollbar as well as the text itself, making the scrollbar padded from the top of the textarea, but this is at least better than before.

Screenshots:
![before](https://cloud.githubusercontent.com/assets/538013/2939557/fe25c932-d94e-11e3-8ad9-1463209fc56d.png)
![after](https://cloud.githubusercontent.com/assets/538013/2939556/fe10b222-d94e-11e3-9335-080960916ddd.png)