Pull request is live!

Easiest way to get a feel for it is , from the HistoGen directory:
`python src\HistoGen.py test\data\example_histos.saf --t`

You can get help with:
`python src\HistoGen.py -h` (or by asking me ;) )

```
usage: HistoGen [-h] [-o OUTDIR] [--verbose] [-t] [-v] infile

Generate some MadAnalysis5 histograms from an associated SAF file.

positional arguments:
  infile                Path to a a valid SAF file describing histogram data

optional arguments:
  -h, --help            show this help message and exit
  -o OUTDIR, --outdir OUTDIR
                        Location in which to store generated histograms
                        ((default is current dir)
  --verbose             Provide lots of output during run (default is silent)
  -t, --terse           Provide some output during run (default is silent)
  -v, --version         show program's version number and exit
```

looking at `HistoGen.py` should also give you a feel for how this can be used a code module instead of as a CLI tool. 

Should get output as below:
![Fig_1.png](https://cdn.steemitimages.com/DQmdRDa4y4gzKJHuGQs8dvaz5GNmYY9tKRFCbtQV2KoJWa3/Fig_1.png)
![Fig_2.png](https://cdn.steemitimages.com/DQmV7mRrf5XAzSv1xfDy7xv7Ya5L2vNgY7AsyPWtgRtNLMq/Fig_2.png)
![Fig_3.png](https://cdn.steemitimages.com/DQmUd91Lc6aR9Kh17cqQjXYZBDK46GUvJjdDiEcbeosiFCW/Fig_3.png)
![Fig_4.png](https://cdn.steemitimages.com/DQmRmK6UCiQXcENs7YwCfVxEZuJVpFXWW4YcmEfFgL6vWtN/Fig_4.png)