Add an option to generate labels next to inputs of type radio or checkbox on the registration page

When adding fields of type radio or checkbox on the registration page there should be the possibility to create labels next to them (see Activate Annotations section on http://platform.xwiki.org/xwiki/bin/view/DevGuide/VerticalForms#H5Bdemo5D-6). Right now the 'label' option allows to generate a label like 'Activate Annotations' in a <dt> element above the <dd> element for the input , but there is no option to generate the 'Yes' and 'No' labels.