Singles directly to export screen

Set up the To Packing and Pack All buttons on the process orders screen
to also check for singles to and send them directly to the export screen
Added sub-heading for package type

Sub-heading added to ready to pack and ready to export screen to show
the name of the package filter that is selected
Packing screen -return to referrer page

Set up so that when you reprocess or save and ship a package it returns
you to the same screen that you came from including the filters.