Notify xwm when new surfaces become available.
Fixes issue #15
Make request resize simpler function for general use.
Do not ack x11 windows for now.
Reject surface size on creation, if pending size was changed from zero.
Show default cursor on NULL pointer surface focused X11 clients.
The last parameter is out parameter now.
Bring parenting to public api.
Make strings copy and set, return failure and give method for setting
with size.
Implement more of NET_WM complicant X11 wm.