bug fix: PHP 5.4 compatibility - fixed "can't use method return value in write context" error bug fix: assing attributes marked as not in variation to parent product
bug fix: PHP 7.0 compatibility bug fix: sanitize variation attribute names bug fix: deleting SKUs during mport with manual records matching enabled
improvement: refactored codebase improvement: speed up import variable products improvement: sync variable product with variations bug fix: do not add featured image to the gallery bug fix: updating existing products by post ID bug fix: adjust prices for variable product imported via option 5 bug fix: import order notes date bug fix: import order refunds date bug fix: import order payment method bug fix: generate order_key during import orders
