1.110.0

Changes

• use transaction in Contact::add_or_lookup() #4059
• Organize the connection pool as a stack rather than a queue to ensure that
  connection page cache is reused more often.
  This speeds up tests by 28%, real usage will have lower speedup. #4065
• Use transaction in update_blocked_mailinglist_contacts. #4058
• Remove Sql.get_conn() interface in favor of .call() and .transaction(). #4055
• Updated provider database.
• Disable DKIM-Checks again #4076
• Switch from "X.Y.Z" and "py-X.Y.Z" to "vX.Y.Z" tags. #4089

Fixes

• Start SQL transactions with IMMEDIATE behaviour rather than default DEFERRED one. #4063
• Fix a problem with Gmail where (auto-)deleted messages would get archived instead of deleted.
  Move them to the Trash folder for Gmail which auto-deletes trashed messages in 30 days #3972
• Clear config cache after backup import. This bug sometimes resulted in the import to seemingly work at first. #4067
• Update timestamps in param columns with transactions. #4083