Fix signup database issues.

Dependencies

• [2] 5IDB3IWS Integrate zcashd-based zaddr validation.
• [3] AWWC6P5Z Add migration to include payment network with addresses.
• [4] B6HWAPDP Modularize & update to recent haskoin.
• [5] U256ZALI Add captcha check to register route.
• [6] 2XQD6KKK Add invitation logic and clean up DBProg error handling.
• [7] 73NDXDEZ Begin implementation of billing event persistence.
• [8] EFSXYZPO Autoformat everything with brittany.
• [*] IZEVQF62 Work in progress replacing sqlite with postgres.
• [*] BROSTG5K Beginning of modularization of server.

Change contents

• replacement in lib/Aftok/Database/PostgreSQL.hs at line 530
  [3.1324]→[3.14139:14185](∅→∅),[3.1819]→[3.14139:14185](∅→∅),[3.14139]→[3.14139:14185](∅→∅)
  − VALUES (?, ?, ?, ?) RETURNING id |]
  [3.1819]

  [3.22348]
  + VALUES (?, ?, ?) RETURNING id |]
• edit in migrations/2020-09-14_23-27-54_users-account-recovery.txt at line 8
  [3.3739]

  [3.3739]
  + ALTER TABLE users ALTER COLUMN default_payment_addr DROP NOT NULL;
• edit in migrations/2020-09-14_23-27-54_users-account-recovery.txt at line 11
  [3.3750]

  [3.3750]
  + ALTER TABLE users ALTER COLUMN default_payment_addr SET NOT NULL;
• replacement in server/Aftok/Snaplet/Users.hs at line 90
  [2.5740]→[2.5740:5801](∅→∅)
  − <*> (parseInvitationCodes =<< v .: "invitation_codes")
  [2.5740]

  [3.10820]
  + <*> (parseInvitationCodes . maybeToList =<< v .:? "invitation_codes")