documenting the mwm hints

[Havoc Pennington <hp redhat com>]

Hi,

We seem to implicitly assume that all WMs will support the MWM hints -
though in practice it seems many only honor the "no decorations"
setting - but I don't think those hints are actually documented
anywhere. I've only found vague docs in the Lesstif source code (or
rather the GTK code copied from there).

Anyone know of other docs? We should probably document them in 
the spec.

Havoc