Don't crash after displaying a connection error popup

Error popups are modal dialogs running a nested event loop, which means
that events will continue to be processed while the popup is showing.
In this particular case, the socket would close, and the authhandler calling
the popup synchronously would be deleted, leading to a segfault when closing
the popup.

Making this a queued connection prevents this from happening, as control is
not going to be returned to the deleted authhandler that way.
Add disconnection reasons

This will display the reason for disconnection from the core in case of
an incompatible protocol version or missing SSL in the status bar.
Fix grammar bug in ChatViewSettings

Thanks to Redmar over at Launchpad for noticing.
update translation files according to previous commit
Make sure that clients can't access buffers belonging to other users

A manipulated, but properly authenticated client was able to retrieve
the backlog of other users on the same core in some cases by providing
an appropriate BufferID to the storage engine. Note that proper
authentication was still required, so exploiting this requires
malicious users on your core. This commit fixes this issue by ensuring
that foreign BufferIDs are off-limits.
Add the "Copy Selection" context menu item after checking for chat items

When right clicking a channel, Quassel will drop all other items from
the context menu.
We work around this by checking for a selection after everything else
has been added to the menu, and make sure to add the Copy Selection item
at the top.

Fixes issues #1031 and #1048
Fix context menu not being restored properly

When showing a context menu on a clickable, we used to hide existing
context menu item to avoid confusing the user. However, those actions
were never unhidden again. This resulted in the context menu not showing
most options ever again in subsequent invocations.

Instead of hiding the actions, we now just clear the menu.
Add separator after "Copy Selection" context menu

This went away with the commit fixing the menu for selections on
clickables, and is now being brought back.
Update AboutDlg

Some new contributors deserve mentioning.
Update ChangeLog
Update translations from Transifex

Many thanks to:
 - cs: Vít Pelčák <vit@pelcak.org>
 - da: furyfire <frazzer@hotmail.com>
 - de: m4yer <m4yer+quassel@minad.de>, ToBeFree <tobias@freiwuppertal.de>, Heffer <felix@fetzig.org>
 - eo: cordata <tiffypet@yahoo.com>
 - fi: Larso <larso@gmx.com>
 - fr: Dorian <munto@free.fr>, GrecKo <gr3cko@gmail.com>
 - gl: Condex <elgomaisa@gmail.com>
 - hi: libregeekingkid <rajuvindane@gmail.com>
 - hu: ulysses <ulysses@kubuntu.org>
 - mr: libregeekingkid <rajuvindane@gmail.com>
 - nl: simonphilips <simon.philips@gmail.com>
 - oc: Cedric31 <cvalmary@yahoo.fr>
 - pl: derpella <matwa@poczta.pl>
 - pl: Marcin Jabrzyk <marcin.jabrzyk@gmail.com>
 - pt_BR: Pad <pedroaraujo@colorlesscube.com>
 - ro: roentgen <arthur.titeica@gmail.com>
 - sr: JovanJ <jovanjojkic@gmail.com>
 - tr: volkangezer <volkangezer@gmail.com>, zeugma <sunder67@hotmail.com>
 - uk: Yuri Chornoivan <yurchor@ukr.net>
 - zh_CN: leonfeng <rainofchaos@gmail.com>
mark string untranslatable
tx-sync.sh: try to pull first
transifex.net → .com
update quassel.pot
Update ChangeLog

We had to postpone the release by a day.
Make sys includes POSIX-compliant

We're using <sys/resources.h> in quassel.cpp for the backtrace generation
stuff. Documentation for that header indicates that <sys/time.h> shall also
be included (even though it doesn't seem to be needed for our usage).
Additionally, compiling started to fail in recent FreeBSD versions, because
we lacked the <sys/types.h> include, which seems to be mandated by POSIX
(but not on Linux, although it won't hurt to have it).

tl;dr: This should make Quassel compile on recent versions of FreeBSD again.
Merge branch 'master' of https://github.com/quassel/quassel
removed debug output
code style