Use better labels, such as "Available from Catalog" instead of "By List"
or "Do What I Mean" instead of "By Source".
Add filter box to the "Currently Installed" panel, andmake status marker
the same as on "Available from Catalog".
Also add "gui-pkg-manager" packages, including a "Racket Package Manager"
GUI application (that needs a better icon).
The package that supplies "Racket Package Manager" is not in the main
distribution, since DrRacket already includes the GUI package manager.
The "racket" directory contains a pared-back version of the
repository, roughly.
The "pkgs" directory everything else in the repository, but
organized into packages.
