chanserv enhancements and miscellaneous fixes

History couldn't be enabled by rehash if autoresize-window was nonzero.

fix #616

fix #347

fix #696

1. If both fingerprint and hash are specified, require both instead of either
2. Implement auto-oper on connect

#688: forward-confirmed reverse dns

In particular, allow hostnames without periods (like on a LAN).
This shouldn't be a client compability concern since we allow
vhosts without periods.

* Fix #684
* Fix #683
* Add `CHANSERV CLEAR`
* Allow mode changes from channel founders even when they aren't joined
* Operators with the chanreg capability are exempt from max-channels-per-account
* Small fixes and cleanup

document relationship between registration.enabled and saregister

Assorted fixes

* Fix #679 (borked reply to `JOIN #chan,\r\n`)
* Replace invalid error parameters with *'s in various places
* Fix PART with no message sending an empty trailing parameter to the channel
* Fix some error responses not getting labeled

fix #561, take two

fix #671

fix #646

fix typos

Merge docker files from oragono-docker repository

-P/--publish-all publishes the container ports on a random
host port, which you have to look up using `docker port`.

In the common case they should be published on the same ports.