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
Improve Sales Log Details view (single view of sales log)
remove 'blank' for addresses to enable copy-paste. changed markup and css for addresses to better reflect blank fields. Changed 'blank' to 'not provided' for other fields. Moved date and order number from Billing Details to subtitle.
Show country name rather than just country isocode. Hide address lines that are missing data. Right align and tidy up summation field labels (tax, discount, etc.).
change country isocode lookups to use WPSC_Country.
Merge branch 'improve-single-sales-log-admin' of https://github.com/InstinctBrett/WP-e-Commerce into improve-single-sales-log-admin