UI:
    * rename Save to Create Comparison? (or similar)
    * create a tabbed lower interface, to give more room to graphs
    * add a graph of no comparison and a potential 3rd with comparion (if chosen on first tab of data/numbers)

For bills:
    * might need to be able to mark a specific bill as an outlier:
        - so we ignore the data somehow (think Gas is messing with my bills)
        - and even electricity, water, etc. for when we were away in Europe but mostly gas/elec