Engine-XMPP: wasn't able to close unsynced (not fully joined) mucs

in case of long delays this could easily happen
also, regression-danger due to nonexisting chat windows that the server might send messages for
Engine-XMPP: a server<->client race condition could cause a closed chat to be joined

now this kind of chat is automatically closed and an error message is displayed in the protocol chat
this required a refactoring of OnGroupChatPresenceError because that function expected a non-null XmppGroupChatModel
lib/Twitterizer: updated to fix enforced HTTPS as of 14 Jan 2014 (closes: #940)
Build: avoid unneeded WCF assembly references for ServiceStack.Common
Frontend-GNOME-XMPP: there was no context menu entry to remove contacts from the roster
Engine-Tests: documented known broken URL match case
Merge branch 'stable'
Engine-Twitter: fixed InvalidOperationException thrown by /unfollow command (closes: #947)

This exception was thrown if the Twitter screen name couldn't be found by using
LINQ's Single() method.
Merge branch 'stable'
Frontend-GNOME: highlight counter column

Moved the highlight counter to a separate column. This makes it easier to
truncate the chat name column later.
Frontend-GNOME: chat list shrinkage support (closes: #914)

Allow the chat list to be shrunken by truncating the end of the chat name. The
default size of the chat list is now 1/6 of the window with.
Frontend-GNOME: also clear event activity in Notebook.ClearAllActivity()

Clearing message activity alone was not sufficient and left the user with a
crowded chat list behind. We can't clear highlights here too as that wouldn't be
pushed to the possibly remote engine leaving the user with deja vu next time
he connects to his smuxi-server.
Merge branch 'stable'
Frontend: don't rely on working directory for plink.exe detection

Mono on Windows does not like this.
Merge branch 'stable'
lib/SmartIrc4net (smuxi-stable): updated for idle worker (pinger) thread leak fix (closes: #605)
Merge branch 'stable'
Frontend-GNOME: fixed reconnect no longer shown in server chat menu regression

This was a regression introduced in 43d61f10049f1b0a511f42d1f445cd19ff4b9bcb
Engine(-IRC|-XMPP), Frontend-GNOME: implemented multi identity support (closes: #428)
Engine-IRC: only pass stored networks in invite links (closes: #953)