FR: Integrate dc calculator

[muonzoo]

I love that you added bc to blink! For those of us that are little old-skool and use dc would you consider adding it? As far as I recall, bc is just a preprocessor for dc. I find it far more powerful and more ' coder / comp-sci ' friendly, being RPN and all.

All things being equal it might be quite easy with low overhead for some serious nerd points.

Thanks!
Alan

Edit: typo fix