Issue #1664188 by mattcasey: Fix foreach warnings when visiting uc_ajax_cart/update with no POST data

Issue #1187312 by stewart.adam: Customizable cart messages, also make notification/messages settings clearer.

Also fixes an issue where uc_ajax_stock violated the uc_stock namespace. Note
that this change requires users use another module if they would like to
continue preventing out of stock products from being added to cart.

Fixes a problem where uc_ajax_cart_preprocess_uc_ajax_cart_block_content()
could end prematurely if no discounts were in place, causing $items to be
stdClass objects instead of arrays in the theme template.

Ariel Barreiro authored Sep 23, 2011 and Ricardo Sanz Ante committed Sep 23, 2011

Add clicked_button class tu submit button to allow uc_out_of_stock to perform
its validations.

ajaxCartUpdateCartView calls ajaxCartFormSubmitted, and then ajaxCartReloadCartView, but ajaxCartReloadCartView is called at the end of ajaxCartFormSubmitted, so ajaxCartReloadCartView is called twice and consecutively. So, removing ajaxCartReloadCartView from ajaxCartUpdateCartView makes it the same as ajaxCartFormSubmitted, so ajaxCartUpdateCartView is removed and substituted by ajaxCartFormSubmitted.

(no, is not a tongue twister, actually is a serious commit message ;-)

Added desc field to show attribute info for product.

Issue #897038 by tunic: Fixed duplicate remove message with new Ubercart's cart page remove buttons.

Added option to force cart reload on page load with registered users.

Remove form cart message on completion are never displayed. There's no reason to show them.

Minor changes to meet Drupal coding standars.