$.fn.bindProperty() now accepts a radioValue option. If set, this

will manage standard radio behavior between radio input elements and

a model property. Each input is expected to have bindProperty() called

on it, passing a radioValue corresponding to the appropriate value in

the model's property.
When the element's property (which is expected to be a boolean) changes

to true, the model's property will be set to the radioValue. Otherwise,

to prevent conflicts, nothing will be set on the model (with the

expectation being that another bindProperty() will handle the radio

input that's now checked).
When the model's property changes, the value will be compared against

the radioValue. If they match, the radio input will be checked.
The new radio action support for config form list items now support

taking a radioValue, which is then passed to bindProperty.

Made use of this in a change to associate multiple radio inputs with a

single model property. Verified that the element and model always had

matching states.
Added new unit tests, which pass.