There is now a block in the text.html template that can be extended by

specific text review UIs that need custom render options, such as the ones

that will be used for the prettified XML and JSON viewers.
There is a div wrapping the block that will align the render options

to be consistent with the revision selector in the header.

1) Tested manually with the Markdown UI with a custom template to make sure

that options render nicely.

2) Tested manually with the Markdown UI with the default template to make sure

the layout looks the same as it did without this change.