DISCONNECT Sno for always-on and/or multiclient

fix #1722

fix #1731

CHATHISTORY INVALID_TARGETS was missing the subcommand parameter

Include nick in ERR_LISTMODEALREADYSET and ERR_LISTMODENOTSET

Validate operator vhosts against the configured (or default)
vhosts.valid-regexp

Allow +v users to talk in +R channels.

fix #1714

Fix a panic if the operator class title is empty

Fixing the AUR package link in the README.md file

Show real IP in WHOWAS to opers with ban capability.

fix #1703

update docker readme

It could be the real IP or the proxied IP.

`WHOWAS :` should return an error numeric instead of an empty response

fix #1696

use ergochat/irc-go instead of goshuirc/irc-go

add a FAQ entry for global notices

Help string updates for +f mode

Co-authored-by: Mikaela Suomalainen <mikaela@mikaela.info>

fix help for +f mode

Submitting rc.ergo

/etc/rc.d/rc.ergo

set up new development version

update ChanServ OP command documentation

Show email in NS INFO when user has permission.

update dockerfile and minor changes

Commit 7ce396931c introduced the ability
that every user with an account in the AMODE list of a channel can use
the OP command to restore their modes. Update the chanserv help message
accordingly.

Users logged into an account can see their own email.
Opers with the accreg capability can see all users.

clarify the semantics of additional-nick-limit