Track packages installed as dependencies

[X512]

This is hrev53634.

When installing package a lot of dependency packages may be installed. Otter Browser for example. When uninstalling package, dependencies are still installed. It is difficult to understand which dependency packages need be uninstalled manually. Haiku should record which packages are installed by request and which are installed as dependencies.

Possible solution can be adding "requested-packages" file to "administrative" directory that lists base Haiku package and packages installed by request.