updated and improved product importer and order details now delete with orders

git-svn-id: https://plugins.svn.wordpress.org/wp-easycart/trunk@909188 b8457f37-d9ea-0310-8a92-e5e31aec5664
product export taking into account returns and escaped strings.

git-svn-id: https://plugins.svn.wordpress.org/wp-easycart/trunk@909189 b8457f37-d9ea-0310-8a92-e5e31aec5664