Stable sandbox data converters/readers

- Combine obs in 1min windows and mean before dropna
- Change default thinning_grid_coarse_factor to zero
- Add qc_strategy config option
- Refactoring in the apps to get a proper wsgi
- "show config" command allows selecting sections
- rm data normalisation, let obs weights do this job
- some changes to config parameters and command line args
- Tweak clustering params to reduce rejection rates
- Some refactoring, optimisations and fixes

Merge branch 'refactor/load_data' into devel
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