Add a chanserv/access/list privilege

Replace the existing chanserv/access/list command access,
only used in cs_xop, by a privilege with the same name.

It which allows read-only access to cs_access, cs_flags, cs_xop
and cs_akick, while the already-existing chanserv/access/modify
privilege allows to modify them.
Add an operserv/oper/modify privilege.

The operserv/oper command privilege allows to add operators
with fewer or the same privileges as ourself.
This new privilege allows to have operators who can use operserv/oper
to see the list of operators and their privileges, but cannot add new
operators.
Hide dumb user notice if we are quitting
Squit uplink when I receive an squit for myself
Add exempts and optionally allow authenticated users past m_dnsbl
Move nick register event to make it easier for modules to determine if a newly registered nick is confirmed or not. Add confirm event.
Fix module event prioritization which was broken with the newer
auto-attach event stuff.

Also remove logically dead code from os_defcon, and make os_defcon akill
similar masks to os_session when enforcing session akills.

Fixes #1618 which relies on os_session to be prioritized before
os_defcon.
Set access masks to the case of the nick they match, if any
Show extended strftime output for suspend info
Validate credentials sent via sasl more
Keep the akiller's name when updating the reason.

The name of the oper issuing an akill or a sxline could be removed by updating the reason,
even though addkiller was enabled.
Update the French install instructions.
Update French language file.
Merge pull request #92 from Alef-Burzmali/2.0+update-fr

Update the French translation
Merge pull request #91 from Alef-Burzmali/2.0+fix-addakiller

Keep the akiller's name when updating the reason.
Fix log message when enabling botserv kickers
enc_bcrypt is no longer extra because it doesn't depend on external dependencies anymore
Move chan register event prior to applying final mode changes, so cs_mode can set mlock on register. #1620
Allow mlock to be enforced when unsetting defcon modes
Show access denied if /os kick can't kick the target