Adding four new filters on purchase log SQL Query

Primary use case in my head here is for plugins using wpsc_sales_log_process_bulk_action and wpsc_sales_log_process_extra_tablenav - they should be able to easily filter the actual SQL query, not the items returned.
Added shipwire option to installer

The shipwire option cannot be saved in the *Shipping* settings since a default value/option wasn't being created upon install of WP-e-Commerce.
Merge pull request #345 from amereservant/patch-4

Added shipwire option to installer
Filtering $total_where variable
Bump version.  Pushing 3.8.10
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
Merge remote-tracking branch 'upstream/master'

Conflicts:
	readme.txt
	wpsc-admin/includes/purchase-log-list-table-class.php