Panel close behaviour upon non-AJAX link click is inconsistent with other elements in the library

[gabrielschulhof]

Popup and page both abort closing transitions when the user navigates to another page (AJAX or HTTP). However, panel performs the closing transition before allowing HTTP navigation. This is inconsistent. Thus, we must remove the "click a:jqmData(ajax='false')" handler, and make sure that #6693 continues to be fixed.