Merge pull request #1057 from jbeales/fix-typo-1053-option-2

Fix typo in constant name, capitalize, deprivatize
Fix parameter order for sprintf

Swapped __CLASS__ and $replacement so that the error message is
correct.

Fixes #1058.
Merge pull request #1059 from jbeales/fix-wpsc-country-die-message

Fix parameter order for sprintf
Change deprecated message

Fix for #1060.
Replace WPSC_Country::set() calls with constructor

Since WPSC_Country::set() is no longer supported, sending an array to
WPSC_Country::__construct() seems to create or update a listing as
needed.
Remove calls to WPSC_Country::save()

WPSC_Country::save() is deprecated, and no longer needed. The country
will be saved when the object is created.
Remove call to WPSC_Country::exists()

WPSC_Country::exists() is deprecated, but simply passing the info to
the WPSC_Country constructor should update and/or create as needed.
Don't call deprecated WPSC_Country::get()

Replace calls to the generic WPSC_Country::get() with calls to specific
getters.
Merge pull request #1061 from jbeales/fix-wpsc-country-die-message

Change deprecated message
Merge pull request #1065 from jbeales/fix-deprecated-get-calls

Don't call deprecated WPSC_Country::get()
Merge pull request #1063 from jbeales/fix-deprecated-set-calls

Fix deprecated set calls
Changed informational message when WPSC_Country deprecated method save is called
Merge pull request #1067 from JeffPyeBrook/pr-country-class-save-deprecated-message

Changed deprecated message
Only define constant if it's not defined.

A bit of safety, as @JeffPyeBrook mentioned in #1053