Use is_email(), rather than inaccurate regex checks, for form field validation.
Fix more than a handful of wrong variables used in WPSC_Coupons
Boy howdy.
Whitespace
Merge branch 'master' of https://github.com/wp-e-commerce/WP-e-Commerce
Send country and state through to PayPal only if they exists.  Avoids notices when those fields are removed from checkout.  Fixes #1623