Work in rescaled units in write_energy

  Revised write_energy(), accumulate_net_input() and get_depth_list_ckecksums()
to work more extensively in dimensionally rescaled variables by using the new
unscale arguments to the reproducing_sum() and rotated_field_chksum() functions.
As a result of these changes, 15 rescaling factors were eliminated or moved
toward the end of write_energy.  All answers are bitwise identical.