Correct expiretmeout and updatetimeout descriptions in example.conf, it is no longer triggerd by /os update
Add chanserv:always_lower_ts config option to always lower registered
channels timestamps to the creation time which fixes some race
conditions regarding users joining empty registered channels and doing
things prior to the -o from services coming through.

Without always_lower_ts attempt to bounce mode changes from bad users,
which will work okay in most cases.
Fix NickServ default nick expiry time.
cs_set: Fix showing expiry time in INFO output.
cs_sync: Check for the correct override privilege.
cs_akick: Make the default autokick reason translatable.
os_forbid: It is required to specify a reason.
ns_access: Allow LIST by Services Operators on suspended nicks. Change wording.
ns_ajoin: Fix the number of command parameters. Check for nick suspension. Do not allow just any Services Operator to access other users' AJOIN, require nickserv/ajoin. Change wording.
ns_cert: Add ability for Services Operators to modify other users' certificate lists.
NickServ: Change a few log wordings and add missing log calls to some commands.
ns_suspend and cs_suspend: Fix log wording, and correct syntax to show the reason is optional.
os_session: Add some empty lines to the session help command to improve readability.