tie subscription id to userprofile, and show it in the ipn transactions in the admin

[tsaylor]

if someone buys two memberships with one paypal address, the subscription id will be the differentiator. Should make two profiles for that payer and manually update one with the right information. (prevent overwriting when each new transaction comes in. needs thought?)

[rhysrhaven]

Registering email and paying email should not have to be the same. The main case we have to deal with is one person paying for a few peoples memberships. There should be a 1:1 relationship of Profile <-> Subscription ID. But there shouldn't be any problem having a many to one relationship of Subscription ID <-> Payer ID. And if someone wants to pay us more, separate paypal auto-pay or just changing the amount shouldn't matter to this system.