gvle: a window to manage either installed or installable packages

[Chabrier]

So far, when using gvle, in order to manage packages, we get a menu system.

It does work, but there is many limitations, starting by the unconvenient usage when there is to many packages.

A solution would be to provide a Rstudio like window to manage packages.

An as soon this window would be in place, we could step by step add features like filterign or sorting