SBBP-91 removed add-to-cart buttons on product details page and product list page
SBBP-91 removed one block overwrite and added a new functionality to the event to hide the add-to-cart button on the product details page
SBBP-91 small refactoring of the list view and add-to-cart button url
Merge pull request #29 from sitewards/sbbp-91-add-to-cart-hidden

SBBP-91 removed add-to-cart buttons on product details page and product lists and preserved the original availability of products