instead of prepending. This better allows to run test modules
against installated versions of a package even if the package
under test has the same import root. In this example::
testing/__init__.py
testing/test_pkg_under_test.py
pkg_under_test/
the tests will preferrably run against the installed version
of pkg_under_test whereas before they would always pick
up the local version.
--HG--
branch : prefer_installed
5c8e5acf9d