Remove unused  parameter from wpsc_user_log_deprecated_filter_values()
Modify logic on how taxes and coupons contribute to the total price. There is future iterative work to be done here, and some opportunity for more refined settings in coupons, however, the binary assumptions from those inferred settings were inverted.  We were essentially presuming coupons should always apply, unconditionally, to taxes and shipping.  That assumption led to some odd behavior, including negative taxes.  These changes fix #170
Merge branch 'master' of github.com:wp-e-commerce/WP-e-Commerce