Redesign of database, mainly for three reasons:
(a) we need to send renewal notices to Supporters, and need to keep a
record of when we've sent them,
(b) We need to keep better track of t-shirt requests,
(c) We need to allow for different email addresses for contact other
than the PayPal payer one.
Before doing this, I briefly looked again at CiviCRM. While I can
complete this conversion and all my scripts in just a matter of a few
hours, setup of CiviCRM would take a minimum of a few hours just to
investigate its viability for us and whether I'd be able to maintain it.
So, we're doing custom, ad-hoc stuff still.
This commit has not been tested, it's a first pass that I'll adjust.
