Edge case fix for item_quantity contains condition
Introduce some method parity w/ other new classes

I like having the ability in WPSC_Purchase_Log to filter the entire data array, or each property.  I also like having the ability to easily get_data() and have the whole row available.  When we continue to refactor areas in core, we'll find that many of the functions that we'll use WPSC_Country in will require the entire array of data to be available.
Updating wpsc_get_country to utilize new WPSC_Country class
Erroneous 'test'

Committed in 0e65f08426b63854b5eaba83dcf3e8d179bcec61
Order regions by name
Check if 'subcategory_container' is set.

Causes an error if you don't want to output subcategories using wpsc_print_subcategory() in templates.
Check if 'subcategory_container' is set restructured.
Adding action for generic saving on each tab

Also minor whitespace and esc_url/esc_attr cleanup
Add filter to shipping form settings, props @amereservant
Very minor whitespace adjustments
Don't assume UPS settings are set and an array()
Use selected() instead of checked() on select drop-downs
Update USPS module to properly use test environment. Fixes Issue 50
registration.php has been deprecated since WP 3.1