ngircd protocol module: really kill users

ngIRCd doesn't send a QUIT for each user KILL'ed, so kill them immediately.
Open database files using std::ios_base::binary in db_flatfile, which Windows can require
hs_group: Allow automatic HS GROUP-ing on NS GROUP, and allow vhosts to be per account rather than nick.
ns_group: Don't require a nick param when logged in
irc2sql: removed the currentusers field from the chan table, keeping it updated on each join/part eats too many ressources
Remove mail:restrict as it is no longer useful. Changes nickserv/resetpass default to allow normal users to use it.
Add missing space to session exception expiration message
Make nickserv/glist show the correct expire time for unconfirmed nicks
Do not allow nickserv/ungroup to bypass ns_maxemail, and allow opers to bypass ns_maxemail
Fix compile error in m_sasl_dh-aes and m_sasl_dh-blowfish on unusually old g++ versions
Set nickserv's modesonid on login too
Do not send unregistered notice to users who are logged in, even if their nick isn't registered
Merge pull request #63 from alexbarton/ngircd-fix-KILL

ngircd protocol module: really kill users
Merge pull request #64 from ShutterQuick/2.0+hsgroupsync

2.0+hsgroupsync
Update the dutch language file.
ns_maxemail: Bold code 2 -> 002.
Set LDAP_OPT_NETWORK_TIMEOUT to 0 in m_ldap to prevent the asynchronous
library cals from blocking...

Fix multiple possible null pointer derefs if modules pass null
interfaces (none currently do, but it is allowed)

Fix memory leak from results when services are destructed

Timeout queries that never come back.
Do not allow users to add certs that other users are using. Only allow adding certfps if the user is using it.
Mark all channels as syncing when we connect to our uplink. They will
finish syncing later when the uplink syncs. Normally the channel state
is fully synced here anyway, except if we do not know the modes the
uplink has yet.

Also fix a related issue with resetting chanels and bouncing modes on
our clients, if this is done prior to knowing which modes exist it would
silently fail.
m_ssl_gnutls: Fix deprecation warnings when using newer GnuTLS versions.
Update the dutch language file.