Feature requests

[DBAnthony]

A few suggestions:

• Add 'merge_df' functionality into Plotter
• Allow datasets to be normalised to unity (grouped by the datasets in 'value replacements')
• Add optional 'ignore' as command-line argument for columns you don't want to plot
• Add optional 'vars' as command-line argument for variables you do want to plot (to avoid requring such a specific naming scheme)
• Add option to to classify datasets undefined in the config as 'other'; this is an easy way to plot the datasets you're intereted and combine togethers the other you don't care about
• Add optional 'style' to how variables should be plotted. By this, I just mean using the 'style' option to effectively treat all datasets as signal or all datasets as background for the purposes of plotting