The obfuscation download mode can't change for the moment. It would
require to 'translate' filepaths, or be able to deal with non uniform
databases, don't do that for the moment.

Also update the changelog.

- Readme update
- Changelog update
- WSL and windows build don't work out of the box
- Pb with WSL and the XDG_RUNTIME_DIR env variable

- update README.md
- update CONTRIBUTING.md / CONTRIBUTORS
- lkt manpage
- update changelog