checkout history bulk change commit see notes

- had to duplicate the load_more() function to load_more checkout
  history. If we do this a lot, we should probably modularize that
  function to accept an argument of what to get more of.
  (Also had to create a copy of loadmoreText var as moreHistoryText
  for this purpose.)

Signed-off-by: William Rockwood <wrockwood@tadl.org>