Fix flake8 errors/warnings about import in cubicweb/_exceptions.py We either ignore errors in case of name re-exports and drop re-exports from old backwards compatibility. We fix the only occurrence of NoSelectableObject being imported from cubicweb in tests and update the import to use lgc instead.

missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/*/cubicweb/skeleton/debian/rules)
embedded-javascript-library usr/share/cubicweb/cubes/shared/data/jquery.js