sasl: Use the nick from the presence if the ad-hoc one is not set

fix #3450

Typos: negociat… -> negotiat…

Merge branch 'v9'

In CAP messages, handle the last arg as a list of capabilities

Instead of just one. This fixes the issue of the "trailing whitespace" since we
now split it on ' '

Fix #3442

Handle SASL failures by displaying a message and aborting the connection

Conditionally compile the SASL code only with botan and database

Implement SASL plain authentication

Trivial little naming changes

Fix a signed/unsigned mismatch

Disable the throttle limit if negative

Also, invalid values result in -1 being set

Reflect messages to XMPP only when they are actually sent

Default the throttle limit to 10 if not built with database support

Trivial syntax improvements

Throttle all commands sent to IRC servers

fix #3354

Remove an outdated TODO comment

Archive the Mode messages, except if they are received for an unjoined chan

fix #3362

Channels’ disco#info includes the number of participants

fix #3311

Merge branch 'v8'

Do not use (or present to the user) the Address field in fixed mode

fix #3359

Merge branch 'v8'