#3 Add fast key entry

[Bruce Forsberg]

I was thinking of writing a converter myself then found
this one. Nice job.

I would like to see a fast number key entry added to
the GUI. Look at the entry tab of my mileage calculator
as an example at:

http://mileage.sourceforge.net

The keyboard is hard to use. You could also use a popup
like I do on the trip tab.