sidebar: don't forget to NULL slot pointer after volume is mounted

Or we will hit an assertion when trying to mount another volume later.

https://bugzilla.gnome.org/show_bug.cgi?id=677611
a11y: add a method to create a derived GtkWidgetAccessible type

For EelEditableLabel, we need to create an object derived from the
accessible type of the parent class; since that will be a
GtkWidgetAccessible, which is private, we can't just subclass it using
the regular GObject mechanisms.
This functions creates a derived GType by peeking at the parent
accessible class and type.

https://bugzilla.gnome.org/show_bug.cgi?id=672498
editable-label: fix accessibility support

Use the previously introduced function to create a suitable
GtkAccessible implementation.

https://bugzilla.gnome.org/show_bug.cgi?id=672498
a11y: make sure not to loop while looking for parent get_accessible

If the final class does not override the get_accessible method, it will
inherit it from the parent class; what we're interested in is the first
class for which get_accessible is != from our class get_accessible.
icon-container: use eel_accessibility_create_accessible_gtype

Instead of eel_accessibility_create_derived_type.
a11y: remove now unused code

eel_accessibility_create_derived_gtype() is now unused.
a11y: fix accessibility implementation for NautilusIconContainer

Clean up a11y code and make sure inheritance for
EelCanvasAccessible->NautilusIconContainerAccessible and for
EelCanvasItemAccessible->NautilusIconCanvasItemAccessible work properly.
This makes the ATK state machinery in EelCanvasItemAccessible work
again, which fixes

https://bugzilla.gnome.org/show_bug.cgi?id=677509
window: make sure to hide the main toolbar on the desktop

Fallout from 0a80b533dc81e5175485fe6a2a13c6648c3a07f0
	src/nautilus-file-management-properties.ui.rej
Updated Belarusian translation.
a11y: add missing prototype
icon-container: fix some GCC warnings
Updated Greek translation
places-sidebar: cleanups
places-sidebar: allow dropping of files to bookmarks

Change the way DnD works in the places sidebar.
After this commit, DnD on the bookmarks area will always mean
"copy/move the DnD source into the bookmark" instead of "add a bookmark
to this location" (DnD of bookmark rows in their section will still
reorder them), since that's the most common action you want to do.
This also makes it consistent with the default action obtained by
dropping on the built-in places below.

https://bugzilla.gnome.org/show_bug.cgi?id=645353
Updated Norwegian bokmål translation
search-bar: use GtkSearchEntry
window-menus: disconnect from GtkSettings notifications on finalize

Or if something (e.g. another process via xsettings) causes the
GtkSettings to change the value of gtk-shell-shows-app-menu after a
window is finalized, our callback will run and we'll crash trying to
access freed memory.

https://bugzilla.gnome.org/show_bug.cgi?id=677945
Updated Arabic translation
Fix rename cancellation

This changes the way the wait dialog cancellation callback works. Instead of
cleaning up early we just cancel the operation and wait for proper
rename_callback() carrying the error.

This fixes an assertion failure when the wait dialog has been displayed and user
pressed the Cancel button. Unlikely to happen, found during gvfs testing.
Updated Greek translation