fixed the issue where D->B would always exit the client (was missing a
break statement in amongst all the switches)
layout now looks better (the In/Out spinners now take up the entirety of
the screen horizontally, together, each with 50% of the layout's weight)

also fixed the issue where going into the about activity (etc.) would
populate the array adapter a bunch of times
fixed an issue where decimal->decimal conversion didn't actually do any
conversion, also improved the spinner so that they will automatically do
a conversion immediately after a new type is selected
dynamic conversions look to be working well! update version number.