PEP8 and pylint fixes to examples/soma_radius_fit.
PEP8 and pylint fixes to examples/soma_radius_fit.

eleftherioszisis/NeuroM,wizmer/NeuroM,lidakanari/NeuroM,BlueBrain/NeuroM,juanchopanza/NeuroM,mgeplf/NeuroM,liesbethvanherpe/NeuroM