d/rpmdiff.1: add GPL-2+ license

This patch adds the GPL-2+ license to the rpmdiff.1 file.

Signed-off-by: Arturo Borrero Gonzalez <aborrero@cica.es>
git: ignore autogenerated files

Ignore in git and by dpkg-source all autogenerated files with extensions '.pyc'
and '.pyo'.

Signed-off-by: Arturo Borrero Gonzalez <aborrero@cica.es>