This is a slightly large commit affecting the core functionality of shipments
so I'm happy for all eyeballs I can get on this code. I've tested as thorough
one person can do.
If there are no undiscovered bugs this doesn't change current functionality unless
you change the new setting of "Delivery Policy" available on Client Info and
Organization Info.
See also http://www.adempiere.com/index.php/Delivery_Policy
Link to SF Tracker: http://sourceforge.net/support/tracker.php?aid=3004020