During merge conflicts, these lines should appear in the hunks
and give instructions on how to handle them in the face of the
implementation of `rakeLeaves` for modules in https://git.io/JB1Wk via
`importModules`, that knows how to rake leaves by walking the folder
tree on it's own and collecting leaves that are normal nix files or
folers who contain a `default.nix` mmicking strongly a "recursive"
import-ish syntax.
