Update to 2.24.0:

==============
Version 2.24.0
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* Fix build (Wouter Bolsterlee)
* error window should be closed, expander should start
  unexpanded (#477656) (Matthias Clasen)
* stop using gnome-vfs, start using gio (#512548) (Cosimo Cecchi)
* honour gconf flag to disable user switching (#385119) (Thomas Thurman)
* And a large crowd of translators:
Robert-André Mauchin (af)
Og Maciel, Fabrício Godoy (pt_BR)
Djihed Afifi (ar)
Baris Cicek (tr)
Praveen Arimbrathodiyil (ml)
Shankar Prasad (kn)
Tomasz Dominikowski (pl)
Robert Sedak (hr)
Krishna Babu K (te)
Jorge Gonzalez (es)
Goran Rakic (sr@latin)
Nickolay V. Shmyrev (ru)
Joan Duran (ca)
Friulian translation team (fur)
Simos Xenitellis (el)
Claude Paroz (fr)
Priit Laes (et)
Gabor Kelemen (hu)
Ihar Hrachyshka (be@latin)
Sandeep Shedmake (mr)
Changwoo Ryu (ko)
Åsmund Skjæveland (nn)
Pawan Chitrakar (ne)
Zabeeh Khan (ps)
Pavol Simo (sk)
Daniel Nylander (sv)
Inaki Larranaga Murgoitio (eu)
Yannig Marchegay (oc)

(wiz)