Default panel width

[prdanelli]

I've found a few "issues" while testing and i'm adding them individually so as to keep the discussions focused.

Is it possible to set a wider default width for the panels?

[ldelossa]

Yeah this is needed.

[distek]

@ldelossa would you accept a PR for this?

[ldelossa]

Yup. The window layout code is notoriously tricky, it all takes place in the Panel class's open() function.