Nowadays we only keep one product depending on its name, we do not care
about double even if id is not the same.

As id can contains important and different information even if products
names are the same, we should keep all those product groupes byb name
and pass them all to modules.

Modules will only keep products they can handle

They bring nothing of value (we never use import * anyway) and introduce
a maintenance burden.

The __all__ that I left might not be very useful either but at least
they are not a pain to maintain; they are also used by pyflakes in some
cases.

Signed-off-by: Vicnet <vo.publique@gmail.com>