General PackageFS behavior

Before examining operations details, we supply some general notes about our file system behavior.

PackageFS never asks the user for any confirmation other than those asked by system base tools (if for example, the interactive option $\texttt{-i}$ is given); however the user may modify the package manager default behavior to satisfy his needs. Common preferences may be the installation of some suggested packages and the ``purge''^5.2 operation instead of the typical removal. In fact, after an installation request arises, the user could receive some suggestions about packages to install. Again, when a package has to be removed, it must decide if its configuration files have to be left untouched or deleted. PackageFS actions triggered from these events depend on low-level package manager current settings.