Remove debugging code
Support assocating URLs with each accounting entry

This makes it possible to link to for example scanned invoices stored
elsewhere.

Automatically generate attachment URLs for invoices generated in our
system, as well as for manual Adyen payments.
Fix the sign on manual adyen payment accounts
Autogenerate accountign records for paypal donations as well
Include payment links invoice payments as well

It never hurts to have a linkback to Adyen and Paypal as well as
the link directly to the invoice - since we have the info.