Address php warning/error related to switching theme engines. Fixes #2084 #2085
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Solves:
PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function '_wpsc_action_flush_rewrite_rules' not found or invalid function name in /srv/www/wpecommerce/htdocs/wp-includes/plugin.php on line 525
PHP Fatal error: Cannot redeclare wpsc_is_checkout() (previously declared in /srv/www/wpecommerce/htdocs/wp-content/plugins/wp-e-commerce/wpsc-components/theme-engine-v2/helpers/conditional-tags.php:100) in /srv/www/wpecommerce/htdocs/wp-content/plugins/wp-e-commerce/wpsc-components/theme-engine-v1/helpers/template.php on line 31