Added

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New statement descriptor for SEPA direct-debit

Allow for the use of a statement descriptor for SEPA direct debits.
Improved

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Corrected issues

-Fixed a bug with reports that allowed for a desynchronization to happen for Payouts
-Fixed a bug where in some very rare cases mandates would not be created successfully
-Fixed a bug in some minor cases whereby you could still refund a pay-in that had been disputed
-Fixed a bug where some info was not correctly present in the reports for bank wire pay-ins

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Small enhancements

-Updated the validation service for GB bank accounts to improve reliability
-Add a specific error when trying to refund a non-successful transfer