* atk/atkobject.[c|h]:
Remove property accessible-state; use signal state-change instead
Change signature of state-change handler to take gboolean as argument
instead of AtkPropertyValues
Update atk_object_notify_state_change() to emit state-change signal

* atk/atkstate.[c|h], docs.atkstate.sgml:
Remove state ATK_STATE_COLLAPSED