EWMH: Syncing states and actions

[Matthias Clasen <mclasen redhat com>]

Among other things, 
http://bugzilla.gnome.org/show_bug.cgi?id=352383
points out that there are no _NET_WM_ACTION_ABOVE, thus
window managers cannot communicate support for the above
state to pagers. I propose to add

_NET_WM_ACTION_ABOVE and 
_NET_WM_ACTION_BELOW

to the spec, in analogy to the other actions matching 
states. Note that there are still some states which are
not backed by an action atom, since they are unlikely
to be available to the user via pager ui:

_NET_WM_STATE_MODAL
_NET_WM_STATE_HIDDEN
_NET_WM_STATE_SKIP_{TASKBAR|PAGER}
_NET_WM_STATE_DEMANDS_ATTENTION



Matthias