* Refactor federation sender, again
* Clean up better
* Missing operators
* Try to get overflowed events from database
* Fix queries
* Log less
* Comments
* nil PDUs/EDUs shouldn't happen but guard against them for safety
* Tweak logging
* Fix transaction coalescing
* Update comments
* Check nils more
* Remove channels as they add extra complexity and possibly will deadlock
* Don't hold lock while sending transaction
* Less spam about sleeping queues
* Comments
* Bug-fixing
* Don't try to rehydrate twice
* Don't queue in memory for blacklisted destinations
* Don't queue in memory for blacklisted destinations
* Fix a couple of bugs
* Check for duplicates when pulling things out of the database
* Durable transactions, some more refactoring
* Revert "Durable transactions, some more refactoring"
This reverts commit 5daf924eaaefec5e4f7c12c16ca24e898de4adbb.
* Fix deadlock
* Deduplicate FS database, add some EDU persistence groundwork
* Extend TransactionWriter to use optional existing transaction, use that for FS SQLite database writes
* Fix build due to bad keyserver import
* Working EDU persistence
* gocyclo, unsurprisingly
* Remove unused
* Update copyright notices
