no3.20.0617*New functionality*

* Vatcode added to configuration. The use of this setting is (for now) only relevant for the Tripletex-integration

*Bugfix*

* On custom product that requires a number of pages dividable by something and the file uploaded did not have this the checkbox for approving the preview was correctly removed. If the product allows manually correcting the pagecount the checkbox did not re-appear. Now fixed. Applies only to responsive GUI
* When reordering a custom product only the file and the quantity was used. Fixed so that product selections and job description also is retrieved from original order. Applies only to responsive GUI
* DIBS-online payment was not initialized properly in the non-responsive GUI
* Flippages from mediaarchive for assets with assetnames longer than 50 characters failed to generate. Fixed, so that it truncates the assetname.