Taxes class uses countreis classes for geo information
 leave $region_code and $column as the first two parameters, adding $country as the third.
 attribute paramter consistantly used in function
replaced missing get/set methods for WPSC_Region
removed superfluous reference to $data varable in rcountry and region classes
Merge pull request #1105 from JeffPyeBrook/pr-issue-1104-taxes-from-country-data

Taxes class uses countries classes for geo information