Remove warnings when loading nested network users
Remove warnings when loading nested network users

And lightly simplify code in io.py

yvesalexandre/bandicoot,ulfaslak/bandicoot,econandrew/bandicoot,ulfaslak/bandicoot,econandrew/bandicoot,yvesalexandre/bandicoot,ulfaslak/bandicoot,yvesalexandre/bandicoot,econandrew/bandicoot