Changes to policy period diff plugin

The PolicyPeriodDiffPlugin plugin used to rely upon line-of-business abbreviations to return lobDiffTree.xml files in the function getDiffTreeConfig(PolicyPeriod). With this release, that function is deprecated and Guidewire recommends that you use getDiffTreeConfig(Product) in the gw.product.ProductConfig class. Additionally BADiffTree.xml was removed and replaced with CADiffTree.xml for the commercial auto line.

The PolicyPeriodDiffPlugin plugin is the built-in implementation of the IPolicyPeriodDiffPlugin interface.