Aict-tools

Switch from pyyaml to ruamel.yaml

* Add random source position sampling for theta calculation in `fact_to_dl3`
* Write the samplefraction into files created by `split_data` and copy it in `fact_to_dl3` if present

Merged PRs

* Merge pull request 81 from fact-project/add_sample_fraction
* Merge pull request 80 from fact-project/random_source

Add chunked version of `split_data` for single telescope h5py files to deal with larger than memory files.

* Add long description and classifiers for PyPI

* Publish to PyPI
* Require scikit-learn 0.20.*
* Fix progress bars

Fixes an issue where files would not get opened in read-only mode essentially breaking make files.