aepanel can't tell when an iconified window has been created. I
don't see any easy way around this, given how SubstructureRedirect
works. Possibly CreateNotify...?

That Gnome/KDE WM spec came out a few weeks ago. Worth implementing?
I'm not sure yet.

rxvt (but only an rxvt spawned via Button3 or *-panel) dies if you
kill aewm with ^C. kill -INT is fine. Arrrrgh. I think this is just a
Unixism, or an rxvt bug (twm does it, anyway). Hopefully I am the only
one to use ^C...

Obscure parts of the ICCCM that need to be implemented: WM_COLORMAPS,
WM_TAKE_FOCUS. Shouldn't be very difficult, I just have no pressing
need for them currently. I will bring back wm_cmap_wins when I do
this.

wm_cmap_wins = XInternAtom(dpy, "WM_COLORMAP_WINDOWS", False);
