[STUMP] Split monitor

[38a938c2]

>I'd like to request the feature to split a monitor into multiple monitors,
>much like splitting frames. The difference is that each monitor would
>display one group. So you have multiple monitors which each contain their
>own frames.
>
>The reason why I want this is because there are often windows that I want
>to see regardless of the group I'm working in. For example, an IRC client
>window that I want to monitor (no pun intended). Another advantage is that
>you can dump and load just one part of what's on your screen, namely one
>virtual monitor.
>
>I know of one window manager that has a similar feature, and that's
>herbstluftwm, written in C. It works a bit different there, as you add a
>monitor and define the x and y coordinates, as well as the padding, but
>the idea is the same: view multiple tags on the same physical screen.

Do you want to do a lot of persistent frame-splitting in these groups?
Because if not, you can just use tagging (including frame tagging) to 
split your screen into a few frame sets with window sets changed 
per-frame-set.