CB Paid Subscriptions

- commit f2ece0c5532fa225d7c113c5e92d45850d0fb91d fixes - Free donation amounts error with "Amount not allowed"
- commit 6857d89af78236794e066089fb8a080d970bfc22 fixes - Offline gateway payment errors with "Payment basket does not login."

- commit 2e1a779b23804c797ef43c4d1638d089b6e2d744 OF CB fixes - Front-end offline payment recording saving has fatal error because of backend menu not initialized.

Putting done to 80% as the branch is not yet merged, and a few of the fixes are in CB.