Fixed getting the value of a radio group when several forms use the name

[stof]

getValue was broken in 2 cases for radio buttons:

• radio inputs without a name when the node passed to the method is checked
• multiple input groups with the same name in different forms on the same page

Ref #98

[stof]

note that this does not fix any test failure yet, because the selection of radio buttons is currently broken (and tests rely on it to manipulate radio groups). See #103 for the work on fixing this part.

[aik099]

multiple input groups with the same name in different forms on the same page

Let me rephrase a bit (after looking at code): radios with same name in different forms were considered to be in one group.

[aik099]

radio inputs without a name when the node passed to the method is checked

I wonder who will have a form with a single radio button on it, that can be unchecked once pressed 😄

[aik099]

OK, can be merged.