Fixed variable error in wpsc-shipping/usps_20.php

The variable being tested is NOT the one being assigned the new instance of ASHTools().
Filter gateway checkout form output
Fix warning
Add docblocks for all functions in gateways.php
Log a user in after they fill out the reg form. Props mindbreaker.
Fix stripslashes issues when duplicating products. Props benhuson.
Merge branch 'master' of https://github.com/wp-e-commerce/WP-e-Commerce
Merge pull request #204 from leewillis77/issue_76

Fix issue #76
Fix Issue #209

The lines that I have removed used to be useful back when the return
value of this function included the state. Now that it doesn't they
just waste CPU cycles & disk space.
Merge pull request #210 from jbeales/issue-209

Fix for #209
Limit quantity of individual products that can be added to the cart. Default value is filterable.
Limit product quantities @since 3.8.10 and documentation formatting.
Ensure all variations are deleted when deleting a product.
Fix split() deprecation notice in PHP 5.3+
Merge branch 'master' of https://github.com/wp-e-commerce/WP-e-Commerce
Replace plus-minus.png with CSS.
Added new coupon display files
Improved formatting
Link to new edit view
Remove coupon edit form