#1 External / Internal package distinction

[Pawel Kowalski]

At the moment, it's not visible, which packages are from
the analyzed project (internal packages) and which
external (deduced from dependencies of project
classes). Provide a possibility to control, whether only
internal packages or all packages are displayed. When all
packages (internal and external) were displayed, it would
be nice to have them displayed in different colors (as to
be able to distinguish between intenal and external
packages)