Add monthly donations processing script.

BB-153
Mail template for monthly mails
Print better error messages plus some other cleanups.

BB-153
Create a new recurring Order after payment has been started.

This commit also includes some small cleanups and bug fixes.

BB-153
Integrate mailing into monthly donation script.

BB-153
Display summary of errors at the end of the script.

Also add option to disable emails (for testing).

BB-153
Create correct payment object for status report.

BB-153
Only display error report when there are errors.

BB-153
Disable OpenIBAN conversions by default.

The test service has incorrect and incomplete data.

BB-153