This enhances the configforms in a few ways to allow for more flexible

styling.
First, the boxes now make use of a box-foot class, which is used on

RBCommons. This extensions our box style convention to have a "head",

"main", and "foot", allowing for a separation of CSS rules for the main

part of a box and the footer.
It's also now possible to specify the base template name through a

base_template_name attribute on the ConfigPagesView.
Field rows will now contain a checkbox-row class if it's a checkbox,

radio button, or a multi-select of checkboxes.
Finally, there was a typo where clas= was used instead of class=,

which has been fixed.

Made use of these fixes in another change.
Saw that things still looked correct on Review Board.