Merge pull request #1199 from JeffPyeBrook/pr-fix-update-routines

corrected upgrade routine to update country by country id when changing country iso code
check for current WPeC database version less than 11 before adding notes to countries in lists
added convenience routine to get the current database version and return it as an integer
use WPSC_Countries class to get countries list rather than go directly at database
removed direct reference to country list in currency table, use WPSC_Countries instead
Merge pull request #1200 from JeffPyeBrook/pr-remove-3166-in-country-list-after-upgrade

Country ISO Code 3166 Upgrade Fixes
fix erroneous variable change."
When clicking 'Edit Shipping' on variations, don't jump
fixed bug caused by using improper check for array key
Merge pull request #1201 from JeffPyeBrook/pr-general-settings-region

fixed bug caused by using improper check for array key