~/mss dir should be configurable by an env var

[Reimar Bauer]

we have a hardcoded name for user and demodata to ~/mss

If we make this configurable by an env var and the config_loader we can do tests with many users on one system.

After having it configurable we can define that a second mscolab user on the same system (account) needs to have a different mss_dir.

e.g.

export mss_dir=~/mss.1
python mslib/msui/mss_pyui.py

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Also changing this can prevent users to have a repository clone also to this path together with data.

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[Reimar Bauer]

we have "data_dir" in the config_loader.

[Reimar Bauer]

it is configurable by the mss_settings.json file, For an end user this gets more complex by having alternatives by an env var. A dev has also other options by e.g. a different fork.