Fixes (4)

• 2019-07-25 #BUG-7736 (Maxim Kuznetsov)

  Upgrade failed when opening modules' upgrade hooks. Fixed. #Core

• 2019-07-23 #BUG-7712 (Maxim Kuznetsov)

  Ideas.x-cart.com URL updated for https://www.x-cart.com/contact-us.html #Core #FileAttachments #PINCodes #RelatedProducts #BulkEditing #CustomProductTabs

• 2019-07-16 #BUG-7547 (Maxim Kuznetsov)

  Irrelevant messages for the v5.4.0.x upgrade tool. Fixed. #Core

• 2019-07-04 #BUG-7645 (Kirill Stadler)

  MariaDB version was defined incorrectly for 5.3->5.4 upgrade. Fixed. #Core