correct indentation and a few bugs.
map the drive scale on output so that we get and set the same range (0-10) even though we use a higher range internally (0-255).
update to match the protocol of recieverTest.ino and add some help
Add a slider to control the driveScale
Fix compile errors. (We're not in python anymore, Toto!)
Add support for 2 other ways of working out the tank steering for testing IRL