Nuremberg 1561

Changelog

Bugfixes

• Switch to computation output polling by default (#313)
• Discard agreement on error in/creating an activity (#294)
• Rewrite find_offers() so that CancelledError is not caught (#308)
• Fix the PollingBatch with the current version of yagna (based on #302) (#315)
• Improve error message on failure to accept a debit note (#299)

Additional features

• Integration tests using goth (#307 )