Reuse panes instead of creating (double) new panes if hyperlayout is re-run

[nervetattoo]

It would be nice if hyperlayout could reuse existing panes if the layout in the current tab matches what was requested.
If i run hyperlayout twice, something I do to have it start a bunch of servers in different panes, it will create all new panes in addition to those that are open, in effect resulting in the wrong layout.