Safe string

[ygrek]

including some changes from #98

[hazofaifo]

Just to give some feedback, everything looks fine for the moment

Building on debian:stable-slim docker image

./configure --disable-gui --disable-multinet make mlnet

Thanks a lot for the work

[ygrek]

thanks for testing!

[bestlem]

@ygek given the large change is it worth doing a new release?