See also:

  https://discuss.python.org/t/should-there-be-a-new-standard-for-installing-arbitrary-data-
files/7853/72

and:

   https://stackoverflow.com/questions/36846260/can-python-setuptools-install-files-outside-
dist-packages

I have added:
 
    if 'bdist_wheel' in sys.argv:
        raise RuntimeError("This setup.py does not support wheels")

before the call to main() in setup.py and this forces pip to install using something
other than bdist_wheel which ignores all the work that was done to put data files
outside of the python system path.

Also as part of this, I need to make roundup look in site-packages/usr/.../share/...
for its templates otherwise issue 2551130 will not be possible.

Locale also needs to be found under site-packages/usr/.../share/....