Update upload/system/engine/loader.php

loader readded
Update upload/system/library/session.php

session class revert to avoid session that might have already started
Update upload/catalog/controller/common/header.php
Default invoice prefix has been changed

INV-2012-00 -> INV-2013-00
Merge pull request #363 from e-piksel/v1.5.5.1

Default invoice prefix has been changed
Update upload/install/model/upgrade.php

upgrade fix
Update upload/install/controller/upgrade.php
Update upload/install/model/upgrade.php

change insert to replace to avoid dupicate entries
Update upload/system/library/language.php

to stop the system exiting when a language file can not be found
Update upload/admin/view/template/sale/contact.tpl

fix for problem with mail ckeditor
Update upload/catalog/controller/checkout/cart.php

removed stupid google checkout code
Update upload/catalog/view/theme/default/template/checkout/cart.tpl

removed stupid google checkout code
Update upload/install/opencart.sql

removed wget from robots list as some servers have security blocking saving of settings
Update upload/admin/model/catalog/product.php

fix for product copy error when products have options
Update upload/admin/controller/catalog/product.php

fix for product copy error when products have options
Update upload/admin/controller/sale/order.php

bug for fix to allow upload types
Update upload/admin/controller/payment/klarna_invoice.php

klarna update
Update upload/admin/language/english/payment/klarna_invoice.php

klarna update
Update upload/catalog/controller/payment/klarna_account.php

klarna update
Update upload/catalog/controller/payment/klarna_invoice.php

klarna update