import from src is confusing and breaks packages

[xtofl]

As mentioned in my comment on f3b7979#r171493313, many python files in this repository contain lines like

import src.this  # bad

When installing this code as a package, it will not work - unless the package is actually called src. Also, it leads to bad habits like setting sys.path from within imported modules (I've seen this practice many times).

Maybe the idea was to not care for packaging, in which case I suggest removing the src/ and test/ folders altogether.