Fix metadata notice in wpsc_product_image().  Fixes #983
Send property to filter so that hooks can select their option if selected
Merge pull request #1029 from marcusds/improve-coupon-filter

Send property to filter so that hooks can select their option if selecte...
Send property to filter so that hooks can select their option if selected
Merge remote-tracking branch 'upstream/master'
All coupon callbacks to be regular functions
Add check for ['sizes'] in _wpsc_regenerate_thumbnail_size().
Merge pull request #1034 from marcusds/extend-coupon-callbacks

Extend coupon callbacks
Modify logic slightly in coupons class comparison code to allow for hotfixing.
Don't absint() stock levels.  There are very standard scenarios in which a negative stock level would be acceptable.
Document our new coupon callback logic.
Send proper tax amount on aggregate carts in PayPal Standard.  Fixes #651.  Props Mihai.
Only show countries in currency list in PayPal Express that are actually visible.  If an administrator causes a currency to become invisible, by removing it from their target markets, it should not be in this list. Fixes #1010
Clean up Variation Controls string, add it to the Shipping tab on Variations.  Fixes #686
Eliminate errors for missing indices on sales log page when standard checkout fields are not used. Fixes #741.
Remove deep-seated Google Checkout references.
Merge remote-tracking branch 'upstream/master' into pr-customer-meta-checkout-country-region-currency

Conflicts:
	wpsc-merchants/paypal-express.merchant.php
Merge branch 'pr-customer-meta-checkout-country-region-currency' of github.com:JeffPyeBrook/WP-e-Commerce into pr-customer-meta-checkout-country-region-currency