Update to new soledad package scheme.
Add first draft of mail UI
Improve test coverage for ProviderBootstrapper.
Improve test coverage for VPNGatewaySelector.
Improve test coverage for StreamToLogger.
Merge remote-tracking branch 'ivan/feature/improve-coverage' into develop
Merge remote-tracking branch 'chiiph/feature/mail_ui' into develop
Merge branch 'develop' of ssh://leap.se/leap_client into develop
pep8
Merge remote-tracking branch 'drebs/feature/3487-split-soledad-into-common-client-and-server' into develop
Merge remote-tracking branch 'kali/bug/pep8' into develop
Remove unused resources path.
Add preferences panel.
Add password change feature.
Add changes file. Closes #2798, #3500.