Merge pull request #728 from benkonrath/monthly-donations-process

Adjust monthly donation email subjects and global sender.
Set donation_type to recurring when processing monthly donations.
Add created and updated to Order admin.
Set consistent created / updated time on processed recurring Orders.
Ensure that there are not 2 DocDataWebDirectDirectDebit objects created.
Set correct bank statement description for monthly Orders.
Remove auto created top three recurring Orders on error.