Tested caching
Implemented get country list method
Converted many of the direct sql queries to the currency table to use our class, about 15 done.

Conflicts:
	wpsc-components/theme-engine-v1/helpers/ajax.php
	wpsc-includes/cart.class.php
Use WPSC_Country_Region rather than go direct to database
Use WPSC_Country_Region rather than go direct to the database
Use WPSC_Country_region rather than go direct to the database.
Use WPSC_Country_region rather than go direct to the database.
Use WPSC_Checkout_Form rather than go direct to the database.
Rmeoved commented out line
Use WPSC_Country_region rather than go direct to the database.
Use WPSC_Country_region for currency code rather than go direct to the database.
Use WPSC_Country_region rather than go direct to the database.
cleaned up some variable names and re-tested core functions
Add class function to WPSC_Country_region to retrieve and cache all currency codes.
Use WPSC_Country_region rather than go direct to the database.