Clean-up of countries class initialization
* Complicated data maps initialization routine broken up in favour of much easier to understand, smaller, single purpose, individual data map initialization routines
* Removes the possibility of two data maps being dependant on each other causing recursion
* Removed code that is no longer necessary
* Simplified initialization and clear data operations
* Removed unused internal function
* Cleaned up PHPDoc blocks

Retested WPSC_Countries API
* Fixed functions not working as a result of method name changes in prior commits
* Updated WPSC_Data_Map recursion prevention check to be fully re-entrant and handle cases where class was being constructed by multiple parents
Removed filter targeted at replacing re-calculate message
Changed _wpsc_javascript_localizations to wpsc_javascript_localizations making it a generally available filter
Merge branch 'pr-issue-1151-calculate-message-filter' into dev-master
Merge branch 'pr-issue-1154-countries-class-init-cleanup' into dev-master

Conflicts:
	wpsc-includes/wpsc-countries.class.php
	wpsc-includes/wpsc-data-map.class.php