bug#14964: 24.3.50; doc of `compare-window-configurations'

[martin rudalics]

> The doc doesn't tell you enough about what this function does to be able
> to use it.  Compare how?  What does a non-nil or nil return value mean?
> Does the order of the two arguments matter?  What's going on here?  What
> for?

I never understood the purpose of this function.  Does anyone use it?

martin