better support for every order line items and better price handler

I would have submitted this, but as it's a bit of a change, I'd rather let you review it first.

I was working on reporting line items, and I am using other modules that adds line items to orders (besides tax and shipping), so I did a module that gathers all line items from ubercart and feed that to views. If new line items are added, the views cache has to be rebuilt, but that's not a huge compromise. Old tax and shipping should work exactly the same. I changed the group for line items to "Ubercart order line item".

I also improved the money amount handler to use a better one from ubercart. Refer to #578334: uc_product price views bugfix and one small enhancement for more information, but basically I submitted a patch that got accepted that let you use the price field either as a numeric value or as an ubercart price. There's still a bug in ubercart on that price handler, but it only affects numeric formatting so basic uc_price will still work with the new improvements. I have submitted a new patch for ubercart with that fixed and also a slight improvement which this modules will also take advantage once committed.d