when we want old_group_name, we get it from C_JID column so that it's not escaped

fix the unregister_account bug

NameError: name 'DbusPrototype' is not defined

are there others ?

add close button [no new string here, thanks to GTK+] and show it for when we read received single messages instead of showing cancel [which is when we send]; add icon to send button; move ui preparation code to the right method and add some code to handle show/hide for close/cancel button. add a fixme for after 0.9 for string thing