These ten new tests duplicate the ones that are already there,
but now they test the same functionalities after restoring from
a process record execution log file.  The tests include:

  breakpoints
  watchpoints
  step/next
  finish/until
  shared libraries
  debugging signals and signal handlers.

All pass (except "until", for which I have a temporary tweak
in my source tree, see the ongoing discussion "Seems like a
bug in target_read_stack" in another thread).