FIX The table llx_product_lot is now filled/used to store eatby/sellby

dev/skeletons/build_class_from_table.php

htdocs/install/mysql/migration/3.9.0-4.0.0.sql

htdocs/langs/en_US/productbatch.lang

htdocs/product/class/product.class.php

htdocs/product/class/productbatch.class.php

htdocs/product/reassortlot.php

htdocs/product/stock/class/mouvementstock.class.php

htdocs/product/stock/class/productlot.class.php

htdocs/product/stock/mouvement.php

htdocs/product/stock/product.php

htdocs/product/stock/productlot_card.php

htdocs/product/stock/productlot_list.php

htdocs/product/stock/tpl/stocktransfer.tpl.php