Usage: BIND <key> SHOVE_TO_HISTORY
  The SHOVE_TO_HISTORY function adds the contents of the input
  buffer to the command history and then clears the input buffer
  leaving it very empty.  You can get back the line again by using
  the keybinding PREV_HISTORY.  This is useful if you are in
  the middle of typing a very long line and want to interrupt it 
  to type something else, and come back to your long line.
