Fixes to examples script for new python bindings.

[dilawar]

This PR introduces minimal changes to examples to make sure they work with both current and new upcoming python bindings (https://github.com/BhallaLab/moose-core/pull/410).

Scripts failing with new bindings

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/fig_a3.py

  _INFO:traub2005:Created_ prototype: /library[0]/NaF2 of class NaF2
  data_dir = /tmp/2020_04_15
  ReadCell: 74 compartments, 772 channels, 69 others
  ReadCell: 74 compartments, 772 channels, 69 others
  ReadCell: 59 compartments, 501 channels, 54 others
  ReadCell: 59 compartments, 283 channels, 54 others
  ReadCell: 59 compartments, 283 channels, 54 others
  ReadCell: 59 compartments, 539 channels, 54 others
  ReadCell: 50 compartments, 448 channels, 45 others
  ReadCell: 61 compartments, 594 channels, 56 others
  ReadCell: 61 compartments, 594 channels, 56 others
  ReadCell: 59 compartments, 501 channels, 54 others
  ReadCell: 59 compartments, 283 channels, 54 others
  ReadCell: 59 compartments, 283 channels, 54 others
  ReadCell: 137 compartments, 1345 channels, 132 others
  ReadCell: 59 compartments, 607 channels, 54 others
  Traceback (most recent call last):
  File "/home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/fig_a3.py", line 121, in <module>
  main()
  File "/home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/fig_a3.py", line 97, in main
  model_dict = setup_model()
  File "/home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/fig_a3.py", line 63, in setup_model
  moose.ce(root)
  AttributeError: module 'moose' has no attribute 'ce'

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/snippets/mgblock.py

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/test_deeplts.py

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/test_suplts.py

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/test_tuftedrs.py

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/test_spinystellate.py

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/test_nontuftedrs.py

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/test_tuftedib.py

• [x] /home1/dilawars/Work.HG/GITLAB/moose-examples/traub_2005/py/test_hsolve_tcr.py

[dilawar]

fig_a3.py

fig_a2.py