- Removed event skipper from concatenate_h5_files (use shuffle instead)
- Fix for shuffle_h5, and it also copies used_files datagroup if present to shuffled file
- Added authorship to orcasong_plag

Will automatically save histograms to pdf, showing the distribution of
hits among the given bin edges.

McHits automatically if McHits are in blob.

- Minor other stuff

Resolve "Accept None parameter for concatenate"

Closes #7

See merge request !4

- Added new data cut with custom user function support (not ideal atm)

- Add configs for regression dataset