Ert

New features:
- Python 3 support
- PyQt5 support
- Memory usage monitoring
- CLI supports MDA
- CLI supports running single workflow

Improvements:
- Tailored plotting for single data points
- Algorithm recommendations in menu
- Check for observation data
- Better support for lsf-nodes with unknown status
- Various improvements to the documentation
- Communicate analysis completetion
- Help links in the GUI
- Config file name in window title

Code structure and tooling:
- Removed all C-code and CMake
- Removed ERT_SHARE_PATH
- Make CLI independent of Qt

Deprecation:
- Removed the `text` and `tui` interfaces.

Experimental features:
- New iterative ensemble smother algorithm

Fix a bug when parsing arguments in the cli

- Python 3 is experimentally supported (the UI's have only received some manual testing on top of the automatic ones)
- Check that there are observations before running update
- Some improvements to the documentation
- Unknown forward model status added to highlight when the cluster is down
- Add more functionality to the cli

Backport bugfix for Load Results Manually