Issue #1188644 by rszrama: change the method of determining when the 'Save and add another' button is used on the product add form.

#1020976 by rszrama: add settings to bypass specific pricing rules when pre-calculating product sell prices and list out invalid rules beneath it.

#998080 by rszrama: add a settings form for price pre-calculation and action buttons to calculate and delete prices after the manner of the search indexing UI.

#998080 by rszrama: revamp the UI displaying product pricing rules so it conforms to the design of the updated payment methods UI.