add filter to get the description
use utility routine in product feed
Use wpsc_the_product_description in Google product feed
Add filter to wpsc_the_product_description to give plug-ins the opportunity to filter product descriptions
Check to be sure product has weight meta before using value

Conflicts:
	wpsc-components/theme-engine-v1/helpers/template-tags.php
	wpsc-includes/productfeed.php