no need to pass order objects by reference in hook_order, all object in PHP5 are passed as pointer which is sufficent for all our needs

#907440 by univate: Added more detailed information directly to each orders page about any related recurring fees.

refactor recurring product specific code into its own module and make uc_recurring just an api for handle the recurring interface

refactor renewal code so that we can invoke other unrelated orders to use the recurring information in a stored profile

move recurring settings under the payment settings instead of the product feature where they make more sense to configure when you are configuring other payment details

change renewal interval calculations so that instead of using the current time use the next charge field, to ensure the charge times always remain in sync to the second

re-create line items in renewal orders

#634380 by univate: Fixed when max extension attempts is reached, recurring fee is attempted at every cron run.