Add downloads to At A Glance widget
Hide cart on checkout option

- fix undefined variables in download categories/tags widget
- removed unnecessary quantity instance
- various formatting improvements
Merge branch 'ghost1227-issue/2451' into release/2.1
Merge pull request #2454 from sumobi/issue/2413

Hide cart on checkout option
Simplification of logic for #2413
Correct use of checked() for #2413 so the checkbox retains its status
Fix incorrect var names
remove extract