Pyqmix-web

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- Improve, fix, and update how to create an executable
- Turn `pyqmix-web` into a proper Python package that can be published on PyPI
- Add entry point script, such that the user can now simply enter `pyqmix-web`
in their terminal after installation, which will fire up the backend and
open the browser
- Add versioneer
- Enable user to specify pump configuration directory
- Styling of frontend served via the build
- Update to `react-scripts` 2.1.3

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- Display version number of installed `pyqmix` in the frontend

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- Abort current pump operation if user initiates a new one
- User can terminate current pump routine, but not modify it
- Only read pyqmix.config during startup

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- Remove superfluous files

2018.10.xx
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- Documentation improvements

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First release.