[g2p_ana] E.M. self energy

[K Slifer]

FWIW:  Article <http://inspirehep.net/record/1193953?ln=en> by Walker-Loud,
Carlson, Miller on the Cottingham formula for Mp-Mn.

The application is more relevant to our form-factor colleagues, but a neat
application of low Q2 spin data.
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