bookmarks-window: remove methods that deal with geometry

Since we don't actually save or load it from disk, these are useless.
bookmarks-window: cleanup NautilusBookmarksWindow

Make this transient to the window that spawned it, and destroy it with
its parent.
entry: remove now unused user_changed signal
clipboard: remove unused code
editable-label: fix selection color in backdrop state

Don't set the ACTIVE flag if we don't have focus, it just doesn't make
sense.
bookmarks-window: reset transient window and screen when presenting

This makes the bookmarks window play nicer when multiple windows are
involved.
Updated POTFILES.in
Updated Spanish translation
application: simplify code
application: don't let the 'Quit' menu action also close desktops

We don't want the quit item on the app menu to close the desktop, if we
have that preference enabled in GSettings.
window-menus: hide "Close All Windows" when the app menu is showing

Since it's the same as our "Quit" option.
application: remove unused code

Just activate the GAction when the menu item is clicked.
all: use g_application_get_default()

Instead of nautilus_application_get_singleton()
application: don't handle the singleton ourselves

Since GIO has g_application_get_default() now, there's no need to keep
track of the singleton ourselves.
Remove the _get_singleton() method from NautilusApplication.
window-menus: activate GActions when possible

For actions that have a corresponding GAction available, activate them
instead of duplicating activation code.
window-menus: hide "Help" menu when using an application menu

It doesn't make a lot of sense to keep it with a list of entries like that
without "All Topics", which is now in the application menu; so hide it
entirely in such a case.
Updated Hebrew translation.
Remove gtk accel map functionality

https://bugzilla.gnome.org/show_bug.cgi?id=646584
Don't trust .desktop files in .gnome2

gnome-panel no longer stores files there.

https://bugzilla.gnome.org/show_bug.cgi?id=646584
Migrate .gnome2 scripts dir to use XDG data dir

https://bugzilla.gnome.org/show_bug.cgi?id=646584