make logging directory default to user owned directory

[asch99]

I want to include in dosma in a docker container. All works fine, but the container must be run as root because dosma wants to write to a logfile which is created in a system directory. I would like to run the container as an unprivileged user, so I don't run into ownership problems of the output files.

Could you consider changing the hard coded logfile path (output_dir() in envs.py) to something more easily accessible? Home folder or /tmp?