http://www.termsys.demon.co.uk/vtansi.htm
http://electronics.stackexchange.com/questions/8874/is-it-possible-to-send-characters-through-serial-to-go-up-a-line-on-the-console
Use VT100 escape codes to control the cursor.
Eg.
puts("\033[2J"); // clear screen
puts("\033[0;0H"); // set cursor to 0,0
puts("\033[10B"); // move cursor down 10 lines
puts("\033[5A"); // move cursor up 5 lines
