Improvements to do module

[joereddington]

• Needs a 'logging off' mode.
• Would like a 'print mode' so we can see everything in a sequence, separated by the if nodes.
• 'back' is actually pretty easy to do if you are recording inputs.
  • Record all the inputs
  • receive a 'back' command
  • switch of logging
  • start from the beginning
  • go thought the inputs until n-1, you are now at the right place.