wl_shell_surface patch sets

[Pekka Paalanen]

Hi Kristian,

I have completed the wl_shell_surface implementation.

The Wayland Core protocol bits:
	git://git.collabora.co.uk/git/user/pq/wayland.git shellsurf
	http://cgit.collabora.com/git/user/pq/wayland.git/log/?h=shellsurf

	96f3e40 server: document wl_resource_post_event() arguments
	8a579e6 protocol: add invalid_operation error code to wl_surface
	e5d7b7c protocol: introduce wl_shell_surface
	e445978 util: clear pointers on wl_list_remove()
	97a3c04 server: no errors to a dead client

The Wayland demos bits:
	git://git.collabora.co.uk/git/user/pq/wayland-demos.git shellsurf-v2
	http://cgit.collabora.com/git/user/pq/wayland-demos.git/log/?h=shellsurf-v2

	2b9b279 window: do not crash without wl_shell
	a8ab91d window: fix segfault in window_handle_key()
	5abaf98 shell: check for missing wl_shell_surface
	fe35705 compositor: eliminate wlsc_surface::shell_priv
	3c7640d desktop-shell: update protocol and client to wl_shell_surface
	4ebfe1b shell: fix resume_desktop for zero clients
	8fca00f wl_shell_surface adaptation
	819cc6f compositor: add a comment about wlsc_surface::output

They are based on top of current master HEADs. The interfaces are still in
Wayland core. There are also few misc fixes among the commits.

- pq