Check that tput is availalble from ncurses in Cygwin before bootstrap.

Test in Cygwin to see if this resolves #49.
Test that button event handler uses correct output types.
Multiply rolling odo by factor if necessary (fix regression).
Respect value of "send" when reading CAN messages.
Receive and store values for ignored signals, just don't output.
Increment fuel consumed by difference between 2 values, not total each time.
Merge branch 'next' into 1208-combinedodo