[Guidelines change] Changes to the packaging guidelines

Here are the recent changes to the packaging guidelines. - A note was added to the Python guidelines indicating that the python2 stack may go away and that upstreams should be contacted about software not yet ported to python3. *

Estonia Open-EID available again

Hello, I am glad to announce that the Estonia Open-EID client software stack[1], has been unretired and updated to lastest version. To use it, simply install open-eid package. System reboot is recommended[2]. Best regards [1]: https://github.com/open-eid/ [2]: