Normalized style for sidebar 'shopping cart' area

This includes my attempt to wrap the FIELDSET[id=aspect_paymentsystem_ShoppingCartTransformer_list_Payment] in a wrapper DIV.ds-option-set
Merge remote-tracking branch 'origin/sidebar-cart-style' into dryad-staging
Remove extra wrapper

It was causing the shopping cart to not display, and it appeared to be unused.