The default log invoked when hitting `j` is now composed of the working copy history as well as all
ancestors, recent commits to visible heads and the trunk.
`jl` shows the same view, only as oneline commits.
Just like writing and qutebrowser modules, restructured the version
control software module to make more use of dotter's ability to
precisely link files. All contained programs have a top-level directory
and all the files that correspond to that specific software lie beneath
in the directory tree.
