Fixed tab navigation.

The buttons were previously skipped during tab navigation because
they do not have an href attribute. The IPA.button has been fixed
to always provide an href attribute.

Ticket #983

install/ui/details.js

@@ -673,6 +673,8 @@ IPA.button = function(spec) {
 
     var button = $('<a/>', {
         id: spec.id,
+        name: spec.name,
+        href: spec.href || '#' + (spec.name || 'button'),
         html: spec.label,
         title: spec.title || spec.label,
         'class': 'ui-state-default ui-corner-all',